0001819790-21-000020 | 10-Q | XBRL Viewer | Tarsus Pharmaceuticals INC

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2021	May 01, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-39614
Entity Registrant Name	TARSUS PHARMACEUTICALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-4717861
Entity Address, Address Line One	15440 Laguna Canyon Road, Suite 160
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92618
City Area Code	(949)
Local Phone Number	409-9820
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	TARS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,524,474
Amendment Flag	false
Entity Central Index Key	0001819790
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1

Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 156,179	$ 168,129
Restricted cash	20	20
Accounts receivable	25,000	0
Contract asset	7,199	0
Other receivables	247	20
Prepaid expenses and other current assets	2,806	2,486
Total current assets	191,451	170,655
Property and equipment, net of accumulated depreciation	589	548
Operating lease right-of-use asset	584	688
Other assets	1,330	81
Total assets	193,954	171,972
Current liabilities:
Accounts payable and other accrued liabilities	9,433	4,347
Accrued payroll and benefits	685	1,040
Total current liabilities	10,118	5,387
Other long-term liabilities	604	605
Total liabilities	10,722	5,992
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 authorized at March 31, 2021 and December 31, 2020; no shares issued and outstanding at March 31, 2021 and December 31, 2020	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized; 20,703,849 shares issued and 20,524,474 outstanding, which excludes 179,375 shares subject to repurchase at March 31, 2021 (unaudited); 20,502,576 shares issued and 20,323,301 outstanding, which excludes 179,375 shares subject to repurchase at December 31, 2020	4	4
Additional paid-in capital	205,697	198,821
Accumulated deficit	(22,469)	(32,845)
Total stockholders’ equity	183,232	165,980
Total liabilities, preferred stock and stockholders’ equity	$ 193,954	$ 171,972

Condensed Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (shares)	10,000,000	10,000,000
Preferred stock, issued (shares)	0	0
Preferred stock, outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (shares)	200,000,000	200,000,000
Common stock, issued (shares)	20,703,849	20,502,576
Common stock, outstanding (shares)	20,524,474	20,323,301
Common stock, subject to repurchase (shares)	179,375	179,375

Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Total revenues	$ 33,432	$ 0
Operating expenses:
Research and development	16,261	1,512
General and administrative	5,160	606
Total operating expenses	22,718	2,118
Income (loss) from operations before other (expense) income and income taxes	10,714	(2,118)
Other income (expense):
Interest income (expense), net	9	161
Other (expense) income, net	(34)	0
Total other (expense) income	(25)	161
Provision for income taxes	(313)	0
Net income (loss)	10,376	(1,957)
Comprehensive income (loss)	$ 10,376	$ (1,957)
Net income (loss) per share
Basic (usd per share)	$ 0.51	$ (0.74)
Diluted (usd per share)	$ 0.47	$ (0.74)
Weighted-average shares outstanding
Basic (shares)	20,336,022	2,650,363
Diluted (shares)	21,824,574	2,650,363
License fees and Collaboration
Operating expenses:
Cost of license fees and collaboration revenue	$ 1,297	$ 0
License fees
Revenues:
Total revenues	33,311	0
Collaboration
Revenues:
Total revenues	$ 121	$ 0

Condensed Statements of Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Preferred stock, outstanding (shares) at Dec. 31, 2019		8,249,939
Beginning balance at Dec. 31, 2019	$ (6,005)	$ 63,402	$ 2	$ 27	$ (6,034)
Beginning balance (shares) at Dec. 31, 2019			2,646,619
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,957)				(1,957)
Recognition of stock-based compensation expense	4			4
Shares issued as consideration for in-license rights	0
Lapse of repurchase rights related to common stock issued pursuant to early exercises (shares)			4,300
Preferred stock, outstanding (shares) at Mar. 31, 2020		8,249,939
Ending balance at Mar. 31, 2020	$ (7,958)	$ 63,402	$ 2	31	(7,991)
Ending balance (shares) at Mar. 31, 2020			2,650,919
Preferred stock, outstanding (shares) at Dec. 31, 2020	0	0
Beginning balance at Dec. 31, 2020	$ 165,980	$ 0	$ 4	198,821	(32,845)
Beginning balance (shares) at Dec. 31, 2020	20,323,301		20,323,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 10,376				10,376
Recognition of stock-based compensation expense	1,363			1,363
Exercise of vested stock options (shares)			13,773
Exercise of vested stock options	19			19
Shares issued as consideration for in-license rights (shares)			187,500
Shares issued as consideration for in-license rights	$ 5,494			5,494
Preferred stock, outstanding (shares) at Mar. 31, 2021	0	0
Ending balance at Mar. 31, 2021	$ 183,232	$ 0	$ 4	$ 205,697	$ (22,469)
Ending balance (shares) at Mar. 31, 2021	20,524,474		20,524,474

Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities:
Net income (loss)	$ 10,376	$ (1,957)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	64	15
Stock-based compensation (Note 5)	1,363	4
Amortization of operating lease right-of-use asset (Note 8(a))	43	12
Loss on disposal of property and equipment	70	0
Loss on lease termination	2	0
Unrealized gain from transactions denominated in a foreign currency	(35)	0
Issuance of common stock pursuant to in-license agreement	5,494	0
Changes in operating assets and liabilities:
Accounts receivable	(25,000)	0
Contract asset	(7,199)	0
Other receivables	(227)	4
Prepaid expenses and other current assets	(321)	(222)
Other non-current assets	(1,255)	0
Accounts payable and other accrued liabilities	5,063	313
Accrued payroll and benefits	(355)	(165)
Other long-term liabilities	123	0
Net cash used in operating activities	(11,794)	(1,996)
Cash Flows From Investing Activities:
Purchases of property and equipment	(175)	(36)
Cash used in investing activities	(175)	(36)
Cash Flows From Financing Activities:
Payments of issuance costs	0	(27)
Proceeds from early exercise of stock options	19	0
Net cash provided by financing activities	19	(27)
Net decrease in cash, cash equivalents and restricted cash	(11,950)	(2,059)
Cash, cash equivalents, and restricted cash — beginning of year	168,149	57,972
Cash, cash equivalents, and restricted cash — end of period	156,199	55,913
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash	156,199	55,913
Supplemental Disclosures Noncash Investing and Financing Activities:
Additions of property and equipment in accounts payable and other accrued liabilities	0	12
Derecognition of right-of-use asset upon lease termination	(38)	0
Stock issued to licensor pursuant to execution of out-license agreement	$ 5,494	$ 0

Description of Business and Presentation of Financial Statements	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Presentation of Financial Statements	DESCRIPTION OF BUSINESS AND PRESENTATION OF FINANCIAL STATEMENTS (a) Description of Business Tarsus Pharmaceuticals, Inc. (“Tarsus” or the “Company”) is a late clinical-stage biopharmaceutical company focused on the development and commercialization of novel therapeutic candidates to address large market opportunities initially in ophthalmic conditions where there are limited treatment alternatives. (b) Initial Public Offering and Reverse Stock Split On October 20, 2020, the Company completed its initial public offering ("IPO") through an underwritten sale of 6,325,000 shares of its common stock at a price of $16.00 per share, inclusive of an additional 825,000 common shares sold upon the full exercise of the underwriters’ purchase option. The aggregate net proceeds by the Company from the offering totaled $91.7 million after deducting underwriting discounts and commissions and other offering expenses. Concurrent with the closing of the Company's IPO, all then-outstanding shares of its convertible preferred stock (see Note 4) were automatically converted into an aggregate of 11,107,018 issued shares of common stock. On October 8, 2020, the Tarsus Board of Directors approved a 1-for-7.4276 reverse stock split and a certificate of amendment was filed to restate the Company's certificate of incorporation to effect this reverse split. The par value was not adjusted as a result of the reverse stock split. All share and per share information included in the accompanying financial statements give retroactive effect to this reverse stock split for all periods presented. (c) Liquidity Risks The Company has no product sales, and since inception, has accumulated losses and negative cash flows from operations, resulting in an accumulated deficit of $22.5 million as of March 31, 2021 and $32.8 million as of December 31, 2020. The Company’s cash and cash equivalents was $156.2 million and $168.1 million as of March 31, 2021 and December 31, 2020, respectively. The Company has funded its inception to-date operations primarily through equity capital raises. The Company believes that existing capital resources will be sufficient to meet projected operating requirements for at least 12 months from the date of issuance of the accompanying financial statements. The financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. Management expects to continue to incur additional substantial losses in the foreseeable future as a result of the Company’s research and development activities. The Company’s operations have consisted primarily of the build-out of its corporate organization, in-licensing intellectual property, and conducting preclinical and clinical studies. The Company faces risks associated with early-stage biotechnology companies whose product candidates are in development that require significant additional research and development efforts, including extensive preclinical and clinical testing and regulatory approval prior to commercialization. These efforts require the Company to expend large amounts of additional capital to complete research and development, achieve research and development objectives, defend intellectual property rights, and recruit and retain skilled personnel, including key members of management. The Company will be required to raise additional capital to fund future operations, however, no assurance can be given as to whether additional needed financing will be available on terms acceptable to the Company, if at all. If the Company raises additional funds by issuing equity securities, its stockholders may experience dilution. Any future debt financing into which the Company enters may impose additional covenants that restrict operations, including limitations on its ability to incur liens or additional debt, pay dividends, repurchase common stock, make certain investments or engage in certain merger, consolidation or asset sale transactions. Any debt financing or additional equity raise may contain terms that are not favorable to the Company or its stockholders. Further, adequate funding may not be available on acceptable terms, or at all. The Company’s potential inability to raise capital when needed could have a negative impact on its financial condition and ability to pursue planned business strategies. If the Company is unable to raise additional funds as required, it may need to delay, reduce, or terminate some or all its development programs and clinical trials. The Company may also be required to sell or license its rights to product candidates in certain territories or indications that it would otherwise prefer to develop and commercialize on its own. If the Company is required to enter into collaborations and other arrangements to address its liquidity needs, it may have to give up certain rights that limit its ability to develop and commercialize product candidates or may have other terms that are not favorable to the Company or its stockholders, which could materially and adversely affect its business and financial prospects. These factors may adversely impact the Company's ability to achieve its business objectives and would likely have an adverse effect on its future business prospects, or even its ability to remain a going concern. (d) Operating Segment To date, the Company has operated and managed its business and financial information on an aggregate basis for the purposes of evaluating financial performance and the allocation of resources. Accordingly, the Company’s management determined that it operates in one reportable operating segment that is focused exclusively on developing pharmaceutical products for eventual commercialization. (e) Emerging Growth Company Status The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the "JOBS Act"). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. The Company has irrevocably elected to not take this exemption and, as a result, will adopt new or revised accounting standards on the relevant effective dates on which adoption of such standards is required for other public companies that are not emerging growth companies.

Summary of Significant Accounting Policies and Use of Estimates	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Use of Estimates	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND USE OF ESTIMATES (i) Basis of Presentation The Company’s condensed financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and pursuant to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying condensed financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The interim condensed balance sheet as of March 31, 2021, and the interim condensed statements of operations and comprehensive income (loss), changes in preferred stock and stockholders’ equity and cash flows for the three months ended March 31, 2021 and 2020 are unaudited. These unaudited interim financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, which consist of only normal and recurring adjustments, necessary for the fair statement of the Company’s financial information. The financial data and other information disclosed in these notes related to the three and nine-month periods are also unaudited. The condensed balance sheet as of December 31, 2020 has been derived from the audited financial statements at that date but does not include all information and footnotes required by GAAP for complete financial statements. The condensed interim operating results for the three months ended March 31, 2021 are not necessarily indicative of results to be expected for the year ending December 31, 2021, any other interim periods or any future year or period. The accompanying interim unaudited condensed financial statements should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2020 in the Company’s Annual Report on Form 10-K (“Annual Report”) for the fiscal year ended December 31, 2020, as filed with the SEC on March 31, 2021. The preparation of financial statements in conformity with GAAP and with the rules and regulations of the Securities and Exchange Commission (“SEC”) requires management to make informed estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. These amounts may materially differ from the amounts ultimately realized and reported due to the inherent uncertainty of any estimate or assumption. On an on-going basis, management evaluates its most critical estimates and assumptions, including those related to the (i) fair value of equity-based awards and periodic recognition of stock-based compensation, (ii) the realization of income tax assets and estimates of tax liabilities, and (iii) expense accruals related to research and development activities, including clinical trials. Accounting policies and estimates that most significantly impact the presented amounts within the accompanying condensed financial statements are further described below: (ii) Cash and Cash Equivalents Cash and cash equivalents consist of bank deposits and highly liquid investments, including money market fund accounts, with original maturities of three months or less from the purchase date. (iii) Restricted Cash Restricted cash represents cash held as collateral for the Company’s corporate credit card program. Any cash that is legally or contractually restricted from immediate use is classified as restricted cash. (iv) Concentration of Credit Risk and Other Risks and Uncertainties Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents in deposits at financial institutions that exceed federally insured limits. In March 2020, the World Health Organization declared a pandemic related to the global novel coronavirus disease 2019 (“COVID-19”) outbreak. To date, the Company’s operations have not been significantly impacted by the COVID-19 pandemic, though the Company continues to monitor the potential impact COVID-19 may have on its ongoing and planned clinical trials. However, the Company cannot at this time predict the specific extent, duration, or full impact that the COVID-19 outbreak will have on these activities or its financial condition. The Company’s results of operations involve numerous risks and uncertainties. Factors that could adversely impact the Company’s operating results and business objectives include, but are not limited to, (1) uncertainty of results of clinical trials, (2) uncertainty of regulatory approval of the Company’s potential product candidates, including TP-03 for ophthalmic conditions, TP-04 for treatment of skin conditions and TP-05 for prophylaxis of Lyme and community malaria reduction, (3) uncertainty of market acceptance of its product candidates, (4) competition from substitute products and larger companies, (5) securing and protecting proprietary technology and strategic relationships, and (6) and dependence on key individuals and sole source suppliers. The Company’s product candidates require approvals from the U.S. Food and Drug Administration (“FDA”) and comparable foreign regulatory agencies prior to commercial sales in their respective jurisdictions. There can be no assurance that any product candidates will receive these necessary approvals. If the Company is denied approval, approval is delayed, or is unable to maintain approval for any product candidate, it could have a materially adverse impact on the Company's business. (v) Property and Equipment Property and equipment is stated at historical cost and is depreciated on a straight-line basis over an estimated useful life that corresponds with its designated asset category. Leasehold improvements are amortized on a straight-line basis over the shorter of the remaining lease term or the estimated useful lives of related improvements. The Company evaluates the recoverability of “long-lived assets” (which includes property and equipment) whenever events or changes in circumstances in the business indicate that the asset’s carrying amount may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the sum of the future undiscounted cash flows the assets are expected to generate over the remaining useful lives of the assets. If a long-lived asset fails a recoverability test, the Company measures the amount by which the carrying value of the asset exceeds its fair value. Other than the right-of-use ("ROU") asset impairment discussed in Note 8, there were no events or changes in business circumstances during the three months ended March 31, 2021 or year ended December 31, 2020 that indicated the carrying amounts of any long-lived assets were not fully recoverable. (vi) Revenue Recognition for Out-License Arrangements Overview The Company currently has a single out-license arrangement that allows the licensee to market the Company’s TP-03 product (representing "functional intellectual property") in certain territories for a stated term. The accounting and reporting of revenue for out-license arrangements requires significant judgment for: (a) identification of the number of performance obligations within the contract, (b) the contract’s allocable transaction price (including variable consideration), (c) the stand-alone selling price for each performance obligation identified, and (d) the periods over which such revenue is recognized. The Company's out-license arrangement, as described in Note 9, was analyzed to determine whether the promised goods or services, which include the license, and know-how, data, and information necessary or reasonably useful for the research, development, manufacture, or commercialization of any license product, and governance committee services, are distinct, or must be accounted for as part of a combined performance obligation. In assessing whether promised goods or services are distinct, the Company considers factors such as the stage of development of the underlying intellectual property and the capabilities of the customer to develop the intellectual property on their own, and/or whether the required expertise is readily available. If the license is considered to not be distinct, the license is combined with other promised goods or services as a combined performance obligation. The Company enters into out-license arrangements in exchange for the following forms of consideration: (i) upfront cash payments, (ii) equity-based consideration, (iii) sales royalties, (iv) sales threshold milestones, (v) development milestone fees, and (vi) regulatory milestone fees. Revenue is recognized in proportion to the allocated transaction price when (or as) the respective performance obligation is satisfied. The Company evaluates the progress related to each milestone at each reporting period and, if necessary, adjusts the probability of achievement and related revenue recognition. The measure of progress, and thereby periods over which revenue is recognized, are subject to estimates by management and may change over the course of the agreement. Contractual Terms for the Right to Collect Payment The contractual terms that establish the Company’s right to collect payment from its customer once the performance obligation is satisfied and require evaluation of the timing and amount of revenue recognition are as follows: (1) Upfront License Fees: The Company determines whether non-refundable license consideration is recognized at the time of contract execution (i.e., when the license is transferred to the customer and customer is able to use and benefit from the license) or over the actual (or implied) contractual period of the out-license. The Company also evaluates whether it has any other requirements to provide substantive services that are inseparable from the performance obligation of the license transfer to determine whether any combined performance obligation is satisfied over time or at a point in time. (2) Development Milestones: The Company utilizes the “most likely amount” method to estimate the amount of consideration to which it will be entitled for achievement of development milestones. For those payments based on development milestones (e.g., patient dosing in a clinical study or the achievement of statistically significant clinical results), the Company assesses the probability that the milestone will be achieved, including its ability to control the timing or likelihood of achievement, and any associated revenue constraint. At each reporting period, the Company re-evaluates this associated revenue recognition constraint. Any resulting adjustments are recorded to revenue on a cumulative catch-up basis, thus reflected in the financial statements in the period of adjustment. (3) Regulatory Milestones: The Company utilizes the “most likely amount” method to estimate the consideration to which it will be entitled and recognizes revenue in the period regulatory approval occurs (the performance obligation is satisfied). Amounts constrained as variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The Company evaluates whether the milestones are considered probable of being reached and not otherwise constrained. Accordingly, due to the inherent uncertainty of achieving regulatory approval, associated milestones are constrained for revenue recognition until achievement. (4) Royalties: Under the "sales-or-usage-based royalty exception" the Company recognizes revenue based on the contractual percentage of the licensee’s sales to its customers at the later of (i) the occurrence of the related sales or (ii) the date upon which the performance obligation to which some or all of the royalty has been allocated has been satisfied or partially satisfied. To date, the Company has not recognized any royalty revenue from its out-licensing arrangements. (5) Sales Threshold Milestones: Similar to royalties, applying the "sales-or-usage-based royalty exception", the Company recognizes revenue from sales threshold milestones at the later of (i) the period the licensee achieves the one-time annual product sales levels in their territories for which the Company is contractually entitled to a specified lump-sum receipt, or (ii) the date upon which the performance obligation to which some or all of the milestone has been allocated has been satisfied or partially satisfied. To date, the Company has not recognized any sales threshold milestone revenue from out-licensing arrangements. (vii) Research and Development Costs Research and development costs are expensed as incurred or as certain upfront or milestone payments become contractually due to licensors upon the achievement of clinical or regulatory events. These expenses also include internal costs directly attributable to in-development programs, including cost of certain salaries, payroll taxes, employee benefits, and stock-based compensation expense, as well as laboratory and clinical supplies, pre-clinical and clinical trial related expenses, and the cost of services provided by outside contractors. The Company recognizes expense for pre-clinical studies and clinical trial activities performed by these third parties. This is typically based upon estimates of the proportion of work completed over the term of the individual study or trial, as well as patient enrollment and dosing events in accordance with agreements established with clinical research organizations ("CROs") and clinical trial or pre-clinical study sites. The Company has entered, and may continue to enter into, license agreements to access and utilize intellectual property for drug development. In each case, the Company evaluates if the assets acquired in a transaction represent the acquisition of an asset or a business, as defined under applicable GAAP. The Company’s executed in-license agreements (see Note 8(b)) were evaluated and determined to represent asset acquisitions. Because these assets have not yet received regulatory approval and have no alternative future uses, the purchase price for each was immediately recognized as research and development expense. In addition, any future milestone payments (whether in the form of cash or stock) made before product regulatory approval (that do not meet the definition of a derivative) will also be immediately recognized as research and development expense when paid or becomes payable, provided there is no alternative future use of the rights in other research and development projects. (viii) Stock-Based Compensation Stock-based compensation expense is recognized for all equity awards granted to employees, consultants, and members of the Company’s Board of Directors and is recognized at fair value. For stock-based awards that vest subject to the satisfaction of a service requirement, the fair value measurement date is the date of grant and the related expense is recognized on a straight-line basis over each award’s actual or implied vesting period. For stock-based awards that vest subject to a performance condition, the Company recognizes compensation cost if and when it concludes that it is probable that the performance condition will be achieved and the related expense is recognized on an accelerated attribution method. As applicable, the Company reverses previously recognized expense for forfeitures of unvested awards in the period of occurrence. The Company uses the Black-Scholes option pricing model to estimate the fair value of stock-based awards as of the date of grant. The measurement of the fair value of stock-based awards and recognition of stock-based compensation expense requires assumptions to be estimated by management that involve inherent uncertainties and the application of management’s judgment, including (a) the fair value of the Company’s common stock on the date of the option grant, (b) the expected term of the stock option until its exercise by the recipient, (c) stock price volatility over the expected term, (d) the prevailing risk-free interest rate over the expected term, and (e) expected dividend payments over the expected term. Management estimates the expected term of awarded stock options utilizing the “simplified method” for awards as the Company does not yet have sufficient exercise history since its November 2016 formation. Further, prior to the IPO, the Company was privately-held and therefore lacked company-specific historical and implied volatility information of its stock. Accordingly, management estimated this expected volatility based on a designated peer-group of publicly-traded companies for a look-back period, as of the date of grant, that corresponded with the expected term of the awarded stock option. The Company estimates the risk-free interest rate based upon the U.S. Department of the Treasury yield curve in effect at award grant for time periods that correspond with the expected term of the awarded stock option. The Company’s expected dividend yield is zero because it has never paid cash dividends and does not expect to for the foreseeable future. Prior to the IPO, given the absence of a public trading market, the Company’s Board of Directors, with input from management, considered numerous objective and subjective factors to determine the fair value of its common stock. The factors included: (i) third-party valuations of the Company’s common stock; (ii) the Company’s stage of development; (iii) the status of research and development efforts; (iv) the rights, preferences and privileges of the Company’s preferred stock relative to common stock; (v) the Company’s operating results and financial condition, including the Company’s levels of available capital resources; (vi) equity market conditions affecting comparable public companies; (vii) general U.S. market conditions; and (viii) the lack of current marketability of the Company’s common stock. Subsequent to the IPO, the fair value of the Company’s common stock is based on the closing quoted market price of its common stock as reported by the Nasdaq Global Select Market on the date of grant. All stock-based compensation costs are reported in the Statements of Operations and Comprehensive Income (Loss) within "research and development" expense or "general and administrative" expense, based upon the underlying employee's role within the Company. (ix) Income Taxes Income taxes are accounted for using the asset and liability method. Deferred tax assets and liabilities are recorded based on the estimated future tax effects of temporary differences between the tax basis of assets and liabilities and amounts reported in the financial statements, as well as operating losses and tax credit carry forwards using enacted tax rates and laws that are expected to be in effect when the differences are expected to reverse. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period of enactment. Realization of deferred tax assets is dependent upon future earnings, the timing and amount of which are uncertain due to the Company’s historical operating performance and recorded cumulative net losses in prior fiscal periods. A valuation allowance is recorded to reduce deferred tax assets, because based upon a weighting of positive and negative factors, it is more likely than not that these deferred tax assets will not be realized. If and when the Company were to determine that deferred tax assets are realizable, an adjustment to the corresponding valuation allowance would increase the net income in the period that such determination was made. In the event that the Company is assessed interest and/or penalties from taxing authorities that have not been previously accrued, such amounts would be included as a component of “income tax expense” within the Statements of Operations and Comprehensive Income (Loss) in the period the notice was received. To date there have been no interest or penalties charged. In December 2019, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2019-12, Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 removes certain exceptions for performing intraperiod tax allocations, recognizing deferred taxes for investments, and calculating income taxes in interim periods. The guidance also simplifies the accounting for franchise taxes, transactions that result in a step-up in the tax basis of goodwill, and the effect of enacted changes in tax laws or rates in interim periods. The Company adopted ASU 2019-12 in the first quarter of 2021 and had no material impact to its financial statements. (x) Net Income (Loss) per Share Attributable to Common Stockholders Basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period, without the consideration for potential dilutive shares of common stock. Diluted net income (loss) per share is computed by dividing the net loss by the weighted-average number of common stock equivalents outstanding for the period determined using the treasury-stock method and if-converted method, as applicable. The Company’s participating securities include unvested common stock awards issued upon early exercise of certain stock options, as early exercised unvested common stock awards have a non-forfeitable right to dividends. The Company’s participating securities do not have a contractual obligation to share in the Company’s losses, so in periods of net losses, the two-class method of calculating basic and diluted earnings per share is not required. In periods of net income, basic and diluted net loss per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities. In periods of net income, net income is attributed to both common stockholders and participating security holders, and therefore, net income was allocated to common shares and participating securities, as if all of the earnings for the period had been distributed. Diluted earnings per share under the two-class method is calculated using the more dilutive of the treasury stock or the two-class method. Due to a net loss for the three months ended March 31, 2020, all otherwise potentially dilutive securities are antidilutive. Accordingly, basic net loss per share equals diluted net loss per share for the three months ended March 31, 2020. (xi) Fair Value Measurements Assets and liabilities recorded at fair value on a recurring basis in the balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative guidance on fair value measurements establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows: •Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities that are publicly accessible at the measurement date. •Level 2: Observable prices that are based on inputs not quoted on active markets, but that are corroborated by market data. These inputs may include quoted prices for similar assets or liabilities or quoted market prices in markets that are not active to the general public. •Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The carrying amounts for financial instruments consisting of cash and cash equivalents, accounts payable and accrued liabilities approximate fair value due to their short maturities. Derivative instruments (see Note 7) are carried at fair value based on unobservable market inputs. (xii) Comprehensive Income (Loss) Comprehensive income (loss) represents all changes in stockholders’ equity (deficit), except those resulting from distributions to stockholders. For all periods presented, comprehensive income (loss) was the same as reported net income (loss). (xiii) Recently Issued or Effective Accounting Standards Recently issued or effective accounting pronouncements that impact, or may have an impact, on the Company’s financial statements have been discussed within the footnote to which each relates. Other recent accounting pronouncements not disclosed in these condensed financial statements have been determined by the Company’s management to have no impact, or an immaterial impact, on its current and expected future financial position, results of operations, or cash flows.

Balance Sheet Account Detail

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balance Sheet Account Detail

BALANCE SHEET ACCOUNT DETAIL

The composition of selected financial statement captions that comprise the accompanying balance sheets are summarized below:

(a) Property and Equipment, net of Accumulated Depreciation

“Property and equipment, net of accumulated depreciation” consists of the following:


	March 31, 2021		December 31, 2020
Furniture and fixtures	$	349	$	294
Office equipment	52		74
Lab equipment	167		173
Leasehold improvements	163		141
Property and equipment, at cost	731		682
(Less): Accumulated depreciation and amortization	142		134
Property and equipment, net of accumulated depreciation and amortization	$	589	$	548

Depreciation expense (included within “total operating expenses” in the accompanying Statements of Operations and Comprehensive Income (Loss)) for the three months ended March 31, 2021 and 2020 was $64 thousand, and $15 thousand, respectively.

(b) Other Assets

"Other assets" consists of the following:


	March 31, 2021		December 31, 2020
Deposits	$	27	$	33
Equity warrant rights*	1,233		—
Other long term assets	70		48
Other assets	$	1,330	$	81

*In January 2020, the FASB issued Accounting Standards Update No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the Emerging Issues Task Force), which clarifies the interaction of the accounting for equity securities, investments accounted for under the equity method, and certain forward contracts and purchased options. This update is effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years. The Company is in the process of determining the impact the adoption will have on its financial statements, beginning as of and for the three months ending March 31, 2022. In January 2020, the FASB issued Accounting Standards Update No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the Emerging Issues Task Force), which clarifies the interaction of the accounting for equity securities, investments accounted for under the equity method, and certain forward contracts and purchased options. This update is also effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years. The Company is also in the process of determining the impact the adoption will have on its financial statements, also beginning in the first quarter of 2022.

“Accounts payable and other accrued liabilities” consists of the following:


	March 31, 2021		December 31, 2020
Trade accounts payable and other	$	4,997	$	2,237

Operating lease liability, current portion	221		282
Accrued clinical studies	3,567		1,524
Income taxes payable	313		—
Employee stock option early exercise liability, current portion	335		304
Accounts payable and other accrued liabilities	$	9,433	$	4,347

(d) Other Long-Term Liabilities

“Other long-term liabilities” consists of the following:


	March 31, 2021		December 31, 2020
Operating lease liability, non-current portion	$	456	$	549
Derivative liability	123		—
Employee stock option early exercise liability, non-current portion	25		56
Other long-term liabilities	$	604	$	605

Stockholders' Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Stockholders' Equity

STOCKHOLDERS’ EQUITYAuthorized Stock

Under the October 2020 Amended and Restated Certificate of Incorporation, the Company is authorized to issue two classes of stock: common and preferred. The total number of shares authorized for issuance is 200.0 million shares of common stock and 10.0 million shares of preferred stock.

Common Stock Overview and Reserve for Future Issuance

Common stockholders have one vote for each share of common stock held and are entitled to receive any dividends declared by the Company’s Board of Directors when legally available for distribution, then-subject to the dividend rights of the holders of preferred stock. For the three months ended March 31, 2021 and for the year ended December 31, 2020, no dividends were declared.

As of March 31, 2021 and December 31, 2020, the Company had 20.7 million and 20.5 million shares of common stock issued, respectively. At March 31, 2021 and December 31, 2020, the Company had 20.5 million, and 20.3 million shares of common stock outstanding, respectively. The following shares of common stock were reserved for issuance:


	March 31, 2021	December 31, 2020

Stock options issued and outstanding	2,448,675	1,836,739
Stock options reserved for future grant	9,790,635	9,414,091
Total shares of common stock reserved	12,239,310	11,250,830

Stock-Based Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

2020 and 2016 Equity Incentive Plans

The Company's Board of Directors and stockholders adopted and approved the Company's 2020 Equity Incentive Plan (the “2020 Plan”) on October 8, 2020. The 2020 Plan replaced the Company's 2016 Equity Incentive Plan adopted in December 2016 (the “2016 Plan”), however, awards outstanding under the 2016 Plan will continue to be governed by their existing terms. The number of shares of the Company's common stock that were initially available for issuance under the 2020 Plan equaled the initial sum of 9,000,000 shares plus 2,432,980 shares that were then available for issuance under the 2016 Plan. The 2020 Plan provides for the following types of awards: incentive and non-statutory stock options, stock appreciation rights, restricted shares, and restricted stock units.

The number of shares of common stock reserved for issuance under the 2020 Plan are increased automatically on the first business day of each fiscal year, commencing in 2021 and ending in 2030, by a number equal to the lesser of: (i) 4% of the shares of common stock outstanding on the last business day of the prior fiscal year; or (ii) the number of shares determined by the Company's Board of Directors. In general, to the extent that any awards under the 2020 Plan are forfeited, terminate, expire or lapse without the issuance of shares, or if the Company reacquires the shares subject to awards granted under the 2020 Plan, those shares will again become available for issuance under the 2020 Plan, as will shares applied to pay the exercise or purchase price of an award or to satisfy tax withholding obligations related to any award.

Stock-based awards are governed by agreements between the Company and the recipients. Incentive stock options and nonqualified stock options may be granted under the 2020 Plan (and previously the 2016 Plan) at an exercise price of not less than 100% of the fair market value of common stock on the respective date of grant. The grant date is the date the terms of the award are formally approved by the Company’s Board of Directors or its designee.

Through March 31, 2021, all awards issued under the 2020 Plan and 2016 Plan were in the form of stock options. These option agreements have service and/or performance conditions for vesting, unless immediately vested on the date of grant. Stock options granted typically have one to four-year service conditions for full vesting. The performance conditions for vesting are explicitly stated in each option agreement and are associated with clinical, business development, or operational milestones.

Stock options must generally be exercised, if at all, no later than 10 years from the date of grant. Upon termination of employment, vested stock options may be exercised within 12 months after the date of termination upon death; six months after the date of termination upon disability; and three months after the date of termination for all other separations.

Stock-Based Compensation Summary

Stock-based compensation expense is recorded in the accompanying condensed statements of operations and comprehensive income (loss) based on the assigned department of the award recipient. Stock-based compensation expense for the three months ended March 31, 2021 and 2020 was as follows:


	Three months ended March 31,
	2021		2020
Research and development	$	344	$	1
General and administrative	1,019		3
Total stock-based compensation	$	1,363	$	4

Early Exercise Feature of Certain Stock Options

The 2016 Plan permits certain option holders to exercise awarded options prior to vesting. Upon this early exercise, the options become subject to a restricted stock agreement and remain subject to the same vesting provisions in the corresponding stock option award. These unvested options are subject to repurchase by the Company upon termination — at the same price previously exercised. These unvested shares are reported as issued (but not outstanding) on the accompanying Balance Sheets while subject to repurchase by the Company. These shares are also excluded from the basic net income (loss) per share until the repurchase right lapses upon vesting. These shares are considered in the diluted net income per share as of March 31, 2021.

The Company initially records a liability for these early exercises that is subsequently reclassified into stockholders’ equity on a pro rata basis as vesting occurs. As of March 31, 2021 and December 31, 2020, the Company recorded the unvested portion of the exercise proceeds of $0.4 million as a liability from the early exercise in the accompanying Balance Sheets.

Net Income (Loss) Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

NET INCOME (LOSS) PER SHARE

The Company permits certain option holders to exercise awarded options prior to vesting (see Note 5). Upon this early exercise, the options become subject to a restricted stock agreement and remain subject to the same vesting provisions in the corresponding stock option award. These early exercised options are considered to be "participating securities" due to non-forfeitable right to dividends (i.e., even prior to vesting). For the three months ended March 31, 2021, the "two-class method" was utilized to calculate diluted net income per share as it was more dilutive than the "treasury stock method". Due to a net loss for the three months ended March 31, 2020, all otherwise potentially dilutive securities are antidilutive. Accordingly, basic net loss per share equals diluted net loss per share for the three months ended March 31, 2020.

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:


	Three Months Ended March 31,
	2021		2020
Basic EPS
Net income (loss)	$	10,376	$	(1,957)
Less: undistributed income allocated to participating securities	90		—
Net income available to common shareholders	$	10,286	$	(1,957)

Basic weighted average shares outstanding	20,336,022		2,650,363
Net income (loss) per share attributable to common stockholders—basic	$	0.51	$	(0.74)

Diluted EPS
Net income (loss)	$	10,376	$	(1,957)
Less: undistributed income reallocated to participating securities	84		—
Net income available to common shareholders	$	10,292	$	(1,957)

Basic weighted average shares outstanding	20,336,022		2,650,363
Effect of dilutive securities:
Common stock options	1,488,552		—
Diluted weighted average shares outstanding	21,824,574		2,650,363
Net income (loss) per share attributable to common stockholders—diluted	$	0.47	$	(0.74)

During the three months ended March 31, 2021, 0.6 million stock options were excluded from the computation of net income per share because the effect would have been anti-dilutive. Additionally, during the three months ended March 31, 2020, 2.2 million unexercised stock options and 8.2 million shares of preferred stock were excluded from the calculation of diluted net loss per share attributable to common stockholders because their impact under the “treasury stock method” and "if-converted method" would have been anti-dilutive.

Fair Value Measurements

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The table below summarizes certain financial instruments measured at fair value that are included within the accompanying balance sheets, and their designation among the three fair value measurement categories (see Note 2(xiii)):


	March 31, 2021 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	156,179	$	—	$	—	$	156,179
Equity warrant rights	—		—		1,233		1,233
Total assets measured at fair value	$	156,179	$	—	$	1,233	$	157,412

	December 31, 2020 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	168,129	—		—		$	168,129
Total assets measured at fair value	$	168,129	—		—		$	168,129

Money Market Funds

Money market fund holdings are included in "cash and cash equivalents" on the accompanying Balance Sheets and are classified within Level 1 of the fair value hierarchy because of their readily-available market prices in active markets that are publicly accessible at the measurement date. These money market funds are invested in U.S. Treasury, bills, notes, and other obligations issued or guaranteed as to principal and interest by the U.S. Government or its agencies.

Equity Warrant Rights

In March 2021, contemporaneous with the China Out-License transaction (see Note 9), the Company and LianBio Ophthalmology Limited (“LianBio”), executed a warrant agreement for the Company to purchase a stated number of common shares of LianBio, a privately-held China-focused pharmaceutical company, at fair value (on a per share basis at the time of issuance) and will vest upon the achievement of certain clinical and regulatory events.

These warrants are classified as Level 3 in the fair value measurement hierarchy. The most significant assumptions used in the option pricing valuation model to determine fair value include: the estimated current fair value of LianBio common stock, LianBio stock volatility (based on the historical volatility of similar companies), and the probability of achievement of the clinical and regulatory milestones for vesting.

These warrant agreements allow for "noncash settlement" and therefore met the criteria to be recognized as a "derivative asset" on the accompanying Condensed Balance Sheets and are presented within "other assets" as of March 31, 2021 (see Note 3(b)). These warrants will be remeasured with a corresponding amount reported in "other (expense) income, net" on the Statement of Operations and Comprehensive Income (Loss) at each reporting date, until exercised or expired. As of March 31, 2021, none of these warrant rights met the milestone criteria for vesting.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitment & Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitment & Contingencies

COMMITMENTS & CONTINGENCIES

(a) Facility Leases

Overview

In the ordinary course of business, the Company enters lease agreements with unaffiliated parties for the use of office and laboratory facilities and office equipment. As of December 31, 2020, the Company had three active facility leases in Irvine, California. Separately in January 2021, the Company entered into a six-month lease for an additional adjacent administrative office suite that was not capitalized due to its under 12-month term. In December 2020, the Company recorded a

$15 thousand impairment of its "operating lease right-of-use lease asset" in connection with its decision to early terminate one of the leases, which was completed in January 2021.

The Company's remaining two capitalized facility leases for adjacent administrative and laboratory suites in Irvine, California commenced on June 1, 2020. These leases each expire on January 31, 2024 and one includes a renewal option that was not reasonably certain to be exercised at the time of lease commencement for purposes of its associated accounting for capitalized "operating lease right-of-use asset" and accompanying lease liability included within "accounts payable and other accrued liabilities" and "other long-term liabilities" on the accompanying Condensed Balance Sheets, amounting to an aggregate $0.7 million. These operating leases have annual rent that is payable monthly and carry fixed annual increases. Also, under these arrangements, real estate taxes, certain operating expenses, and common area maintenance are paid by the Company; since these costs are variable in nature, they are excluded from the measurement of the reported right-of-use asset and liability and are expensed as incurred.

During the year ended December 31, 2020 and for the three months ended March 31, 2021, the Company had no sublease arrangements with it as lessor.

Components of Lease Expense

The liability associated with each lease is amortized over the respective lease term using the “effective interest rate method.” The Company’s right-of-use asset is amortized over the lease term on a straight-line basis to lease expense, as reported on an allocated basis within “research and development” and “general and administrative” expenses on the accompanying Statements of Operations and Comprehensive Income (Loss). The components of lease cost were as follows:


	Three months ended March 31,
	2021		2020
Operating lease cost	$	60	$	16
Variable lease cost	60		1
Short-term lease cost	32		—
Total lease cost	$	152	$	17

Weighted-Average Remaining Lease Term and Applied Discount Rate as of March 31, 2021 and December 31, 2020

As of March 31, 2021 and December 31, 2020, the Company's active facility leases had a weighted average remaining lease term of 2 years, 10 months and 2 years, 10 months, respectively. The weighted average estimated incremental borrowing rate of 10% was utilized to present value future minimum lease payments since an implicit interest rate was not readily determinable.

Future Contractual Lease Payments as of March 31, 2021

The below table summarizes the (i) minimum lease payments over the next five years and thereafter, (ii) lease arrangement imputed interest, and (iii) present value of future lease payments:


Operating Leases - future payments	March 31, 2021
2021 (remaining nine months)	$	199
2022	271
2023	281
2024	25
2025	—
Total future lease payments, undiscounted	$	776
(Less): Imputed interest	(99)
Present value of operating lease payments	$	677

(b) In-License Agreements for Lotilaner

Agreement for Skin and Eye Disease or Conditions in Humans

In January 2019, the Company entered into an in-license agreement with Elanco Tiergesundheit AG (“Elanco”) for exclusive worldwide rights to certain intellectual property for the development and commercialization of lotilaner in the treatment or cure of any eye or skin disease or condition in humans (the "January 2019 Agreement"). The Company has sole financial responsibility for related development, regulatory, and commercialization activities.

The Company made a $1.0 million upfront payment at execution of the January 2019 Agreement. In September 2020, the Company made a required $1.0 million clinical milestone payment associated with the first of two U.S. pivotal trials for the treatment of Demodex blepharitis. The Company recognized an additional $2.0 million expense for its second pivotal trial milestone in the three months ended March 31, 2021, which was paid in April 2021. These amounts are presented in the applicable period within "research and development" expense in the accompanying Statements of Operations and Comprehensive Income (Loss).

The Company may make further cash payments to Elanco under this January 2019 Agreement upon the achievement of certain clinical milestones in the treatment of human skin diseases using lotilaner for an aggregate maximum of $3.0 million and various commercial and sales threshold milestones for an aggregate maximum of $79.0 million. In addition, the Company will be obligated to pay contractual royalties to Elanco in the single digits of its net sales. If the Company receives certain types of payments from its sublicensees, it will also be obligated to pay Elanco a variable percentage in the low to mid double-digits of such proceeds, except for territories in which the Company achieved applicable regulatory approval prior to sublicense execution.

Agreement for All Other Diseases or Conditions in Humans

In September 2020, the Company executed an expanded license agreement with Elanco, granting it a worldwide license to certain intellectual property for the development and commercialization of lotilaner for the treatment, palliation, prevention, or cure of "all other" diseases and conditions in humans (i.e., beyond that of the eye or skin, the “September 2020 Agreement”). The Company issued Elanco 222,460 shares of its common stock at the execution of the September 2020 Agreement. The value of these shares was $3.1 million ($14.0003 per share, approximating the issuance price of the Company's Series C preferred stock in September 2020).

As of March 26, 2021, the Company entered into an out-license agreement with LianBio (see Note 9), which obligated it to grant Elanco an additional fixed 187,500 shares of the Company's common stock that were otherwise required to be granted no later than the 18-month anniversary of the September 2020 Agreement for the Company's continued license exclusivity. These additional shares were valued at $5.5 million based on the Company's stock closing price of $29.30 per share (on the date the issuance became contractually required) and are reported within "research and development" expense within the accompanying Statements of Operations and Comprehensive Income (Loss) for the three months ended March 31, 2021.

The Company is required to make further cash payments to Elanco under the September 2020 Agreement upon the achievement of various clinical milestones for an aggregate maximum of $4.5 million and various commercial and sales threshold milestones for an aggregate maximum of $77.0 million. In addition, the Company will be obligated to pay contractual royalties to Elanco in the single digits of its net sales. If the Company receives certain types of payments from its sublicensees, it will also be obligated to pay Elanco a variable percentage in the low to mid double-digits of such proceeds, except for territories in which the Company achieved applicable regulatory approval prior to sublicense execution.

The Company has entered into employment agreements with six of its named executive officers. These agreements provide for the payment of certain benefits upon separation of employment under specified circumstances, such as termination without cause, or termination in connection with a change in control event.

(d) Litigation Contingencies

From time to time, the Company may be subject to various litigation and related matters arising in the ordinary course of business. The Company is currently not aware of any such matters where there is at least a reasonable probability that a material loss, if any, has been or will be incurred for financial statement recognition.

(e) Indemnities and Guarantees

The Company has certain indemnity commitments, under which it may be required to make payments to its officers and directors in relation to certain transactions to the maximum extent permitted under applicable laws. The duration of these indemnities varies, and in certain cases, is indefinite and does not provide for any limitation of maximum payments. The Company has not been obligated to make any such payments to date and no liabilities have been recorded for this contingency in the accompanying condensed balance sheets.

Out-License Agreement	3 Months Ended
Out-License Agreement	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Out-License Agreement	OUT-LICENSE AGREEMENT Out-License of TP-03 Commercial Rights in Greater China in March 2021 On March 26, 2021, the Company entered into an out-license agreement (the “China Out-License”) with LianBio for exclusive development and commercialization rights of TP-03 (lotilaner ophthalmic solution, 0.25%) in the People’s Republic of China, Hong Kong, Macau, and Taiwan (the “China Territory”) for the treatment of Demodex blepharitis and Meibomian Gland Disease. LianBio is responsible for all development and commercialization costs in the China Territory. Under the contractual terms of the China Out-License, the Company received $15.0 million in April 2021 and $10.0 million in May 2021. The Company will also receive development and regulatory and sales-based milestones upon achievement of up to $75.0 million and $100.0 million, respectively, as well as tiered mid-to-high-teen royalties on LianBio's sales of TP-03 in the China Territory. The Company also received as consideration, warrant rights to purchase common shares of LianBio, subject to certain TP-03 clinical and regulatory achievements for vesting. The valuation of these at-the-money warrants was based on a discounted cash flow model with the application of highly subjective inputs for this pre-revenue company, including the probability of requisite achievements for vesting. For the three months ended March 31, 2021, the Company recognized "license fees" and "collaboration revenue" of $33.3 million and $0.1 million, respectively (each representing separately valued "performance obligations" in the China Out-License) in the accompanying Condensed Statements of Operations and Comprehensive Income (Loss), in accordance with the revenue recognition accounting policy described in Note 2(vi). These revenue amounts were each recognized upon (i) the transfer of TP-03 license rights in the China Territory to LianBio and (ii) the partial completion of clinical activities and related data for the Company's pivotal trials of TP-03 in the treatment of Demodex blepharitis. In future periods, the Company will recognize additional revenue from contractual receipts due from LianBio as (1) performance obligations are satisfied related to TP-03 pivotal trial completion and associated clinical data and reports are delivered, (2) regulatory approval events are achieved, and (3) LianBio has sales of TP-03 in the China Territory.

Summary of Significant Accounting Policies and Use of Estimates (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Operating Segment	Operating SegmentTo date, the Company has operated and managed its business and financial information on an aggregate basis for the purposes of evaluating financial performance and the allocation of resources. Accordingly, the Company’s management determined that it operates in one reportable operating segment that is focused exclusively on developing pharmaceutical products for eventual commercialization.
Basis of Presentation	Basis of Presentation The Company’s condensed financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and pursuant to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying condensed financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The interim condensed balance sheet as of March 31, 2021, and the interim condensed statements of operations and comprehensive income (loss), changes in preferred stock and stockholders’ equity and cash flows for the three months ended March 31, 2021 and 2020 are unaudited. These unaudited interim financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, which consist of only normal and recurring adjustments, necessary for the fair statement of the Company’s financial information. The financial data and other information disclosed in these notes related to the three and nine-month periods are also unaudited. The condensed balance sheet as of December 31, 2020 has been derived from the audited financial statements at that date but does not include all information and footnotes required by GAAP for complete financial statements. The condensed interim operating results for the three months ended March 31, 2021 are not necessarily indicative of results to be expected for the year ending December 31, 2021, any other interim periods or any future year or period. The accompanying interim unaudited condensed financial statements should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2020 in the Company’s Annual Report on Form 10-K (“Annual Report”) for the fiscal year ended December 31, 2020, as filed with the SEC on March 31, 2021. The preparation of financial statements in conformity with GAAP and with the rules and regulations of the Securities and Exchange Commission (“SEC”) requires management to make informed estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. These amounts may materially differ from the amounts ultimately realized and reported due to the inherent uncertainty of any estimate or assumption. On an on-going basis, management evaluates its most critical estimates and assumptions, including those related to the (i) fair value of equity-based awards and periodic recognition of stock-based compensation, (ii) the realization of income tax assets and estimates of tax liabilities, and (iii) expense accruals related to research and development activities, including clinical trials.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash and cash equivalents consist of bank deposits and highly liquid investments, including money market fund accounts, with original maturities of three months or less from the purchase date.
Restricted Cash	Restricted CashRestricted cash represents cash held as collateral for the Company’s corporate credit card program. Any cash that is legally or contractually restricted from immediate use is classified as restricted cash.
Concentration of Credit Risk and Other Risks and Uncertainties	Concentration of Credit Risk and Other Risks and Uncertainties Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents in deposits at financial institutions that exceed federally insured limits. In March 2020, the World Health Organization declared a pandemic related to the global novel coronavirus disease 2019 (“COVID-19”) outbreak. To date, the Company’s operations have not been significantly impacted by the COVID-19 pandemic, though the Company continues to monitor the potential impact COVID-19 may have on its ongoing and planned clinical trials. However, the Company cannot at this time predict the specific extent, duration, or full impact that the COVID-19 outbreak will have on these activities or its financial condition. The Company’s results of operations involve numerous risks and uncertainties. Factors that could adversely impact the Company’s operating results and business objectives include, but are not limited to, (1) uncertainty of results of clinical trials, (2) uncertainty of regulatory approval of the Company’s potential product candidates, including TP-03 for ophthalmic conditions, TP-04 for treatment of skin conditions and TP-05 for prophylaxis of Lyme and community malaria reduction, (3) uncertainty of market acceptance of its product candidates, (4) competition from substitute products and larger companies, (5) securing and protecting proprietary technology and strategic relationships, and (6) and dependence on key individuals and sole source suppliers. The Company’s product candidates require approvals from the U.S. Food and Drug Administration (“FDA”) and comparable foreign regulatory agencies prior to commercial sales in their respective jurisdictions. There can be no assurance that any product candidates will receive these necessary approvals. If the Company is denied approval, approval is delayed, or is unable to maintain approval for any product candidate, it could have a materially adverse impact on the Company's business.
Property and Equipment	Property and EquipmentProperty and equipment is stated at historical cost and is depreciated on a straight-line basis over an estimated useful life that corresponds with its designated asset category. Leasehold improvements are amortized on a straight-line basis over the shorter of the remaining lease term or the estimated useful lives of related improvements. The Company evaluates the recoverability of “long-lived assets” (which includes property and equipment) whenever events or changes in circumstances in the business indicate that the asset’s carrying amount may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the sum of the future undiscounted cash flows the assets are expected to generate over the remaining useful lives of the assets. If a long-lived asset fails a recoverability test, the Company measures the amount by which the carrying value of the asset exceeds its fair value.
Revenue	Revenue Recognition for Out-License Arrangements Overview The Company currently has a single out-license arrangement that allows the licensee to market the Company’s TP-03 product (representing "functional intellectual property") in certain territories for a stated term. The accounting and reporting of revenue for out-license arrangements requires significant judgment for: (a) identification of the number of performance obligations within the contract, (b) the contract’s allocable transaction price (including variable consideration), (c) the stand-alone selling price for each performance obligation identified, and (d) the periods over which such revenue is recognized. The Company's out-license arrangement, as described in Note 9, was analyzed to determine whether the promised goods or services, which include the license, and know-how, data, and information necessary or reasonably useful for the research, development, manufacture, or commercialization of any license product, and governance committee services, are distinct, or must be accounted for as part of a combined performance obligation. In assessing whether promised goods or services are distinct, the Company considers factors such as the stage of development of the underlying intellectual property and the capabilities of the customer to develop the intellectual property on their own, and/or whether the required expertise is readily available. If the license is considered to not be distinct, the license is combined with other promised goods or services as a combined performance obligation. The Company enters into out-license arrangements in exchange for the following forms of consideration: (i) upfront cash payments, (ii) equity-based consideration, (iii) sales royalties, (iv) sales threshold milestones, (v) development milestone fees, and (vi) regulatory milestone fees. Revenue is recognized in proportion to the allocated transaction price when (or as) the respective performance obligation is satisfied. The Company evaluates the progress related to each milestone at each reporting period and, if necessary, adjusts the probability of achievement and related revenue recognition. The measure of progress, and thereby periods over which revenue is recognized, are subject to estimates by management and may change over the course of the agreement. Contractual Terms for the Right to Collect Payment The contractual terms that establish the Company’s right to collect payment from its customer once the performance obligation is satisfied and require evaluation of the timing and amount of revenue recognition are as follows: (1) Upfront License Fees: The Company determines whether non-refundable license consideration is recognized at the time of contract execution (i.e., when the license is transferred to the customer and customer is able to use and benefit from the license) or over the actual (or implied) contractual period of the out-license. The Company also evaluates whether it has any other requirements to provide substantive services that are inseparable from the performance obligation of the license transfer to determine whether any combined performance obligation is satisfied over time or at a point in time. (2) Development Milestones: The Company utilizes the “most likely amount” method to estimate the amount of consideration to which it will be entitled for achievement of development milestones. For those payments based on development milestones (e.g., patient dosing in a clinical study or the achievement of statistically significant clinical results), the Company assesses the probability that the milestone will be achieved, including its ability to control the timing or likelihood of achievement, and any associated revenue constraint. At each reporting period, the Company re-evaluates this associated revenue recognition constraint. Any resulting adjustments are recorded to revenue on a cumulative catch-up basis, thus reflected in the financial statements in the period of adjustment. (3) Regulatory Milestones: The Company utilizes the “most likely amount” method to estimate the consideration to which it will be entitled and recognizes revenue in the period regulatory approval occurs (the performance obligation is satisfied). Amounts constrained as variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The Company evaluates whether the milestones are considered probable of being reached and not otherwise constrained. Accordingly, due to the inherent uncertainty of achieving regulatory approval, associated milestones are constrained for revenue recognition until achievement. (4) Royalties: Under the "sales-or-usage-based royalty exception" the Company recognizes revenue based on the contractual percentage of the licensee’s sales to its customers at the later of (i) the occurrence of the related sales or (ii) the date upon which the performance obligation to which some or all of the royalty has been allocated has been satisfied or partially satisfied. To date, the Company has not recognized any royalty revenue from its out-licensing arrangements. (5) Sales Threshold Milestones: Similar to royalties, applying the "sales-or-usage-based royalty exception", the Company recognizes revenue from sales threshold milestones at the later of (i) the period the licensee achieves the one-time annual product sales levels in their territories for which the Company is contractually entitled to a specified lump-sum receipt, or (ii) the date upon which the performance obligation to which some or all of the milestone has been allocated has been satisfied or partially satisfied. To date, the Company has not recognized any sales threshold milestone revenue from out-licensing arrangements.
Research and Development Costs	Research and Development CostsResearch and development costs are expensed as incurred or as certain upfront or milestone payments become contractually due to licensors upon the achievement of clinical or regulatory events. These expenses also include internal costs directly attributable to in-development programs, including cost of certain salaries, payroll taxes, employee benefits, and stock-based compensation expense, as well as laboratory and clinical supplies, pre-clinical and clinical trial related expenses, and the cost of services provided by outside contractors. The Company recognizes expense for pre-clinical studies and clinical trial activities performed by these third parties. This is typically based upon estimates of the proportion of work completed over the term of the individual study or trial, as well as patient enrollment and dosing events in accordance with agreements established with clinical research organizations ("CROs") and clinical trial or pre-clinical study sites.The Company has entered, and may continue to enter into, license agreements to access and utilize intellectual property for drug development. In each case, the Company evaluates if the assets acquired in a transaction represent the acquisition of an asset or a business, as defined under applicable GAAP. The Company’s executed in-license agreements (see Note 8(b)) were evaluated and determined to represent asset acquisitions. Because these assets have not yet received regulatory approval and have no alternative future uses, the purchase price for each was immediately recognized as research and development expense. In addition, any future milestone payments (whether in the form of cash or stock) made before product regulatory approval (that do not meet the definition of a derivative) will also be immediately recognized as research and development expense when paid or becomes payable, provided there is no alternative future use of the rights in other research and development projects.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense is recognized for all equity awards granted to employees, consultants, and members of the Company’s Board of Directors and is recognized at fair value. For stock-based awards that vest subject to the satisfaction of a service requirement, the fair value measurement date is the date of grant and the related expense is recognized on a straight-line basis over each award’s actual or implied vesting period. For stock-based awards that vest subject to a performance condition, the Company recognizes compensation cost if and when it concludes that it is probable that the performance condition will be achieved and the related expense is recognized on an accelerated attribution method. As applicable, the Company reverses previously recognized expense for forfeitures of unvested awards in the period of occurrence. The Company uses the Black-Scholes option pricing model to estimate the fair value of stock-based awards as of the date of grant. The measurement of the fair value of stock-based awards and recognition of stock-based compensation expense requires assumptions to be estimated by management that involve inherent uncertainties and the application of management’s judgment, including (a) the fair value of the Company’s common stock on the date of the option grant, (b) the expected term of the stock option until its exercise by the recipient, (c) stock price volatility over the expected term, (d) the prevailing risk-free interest rate over the expected term, and (e) expected dividend payments over the expected term. Management estimates the expected term of awarded stock options utilizing the “simplified method” for awards as the Company does not yet have sufficient exercise history since its November 2016 formation. Further, prior to the IPO, the Company was privately-held and therefore lacked company-specific historical and implied volatility information of its stock. Accordingly, management estimated this expected volatility based on a designated peer-group of publicly-traded companies for a look-back period, as of the date of grant, that corresponded with the expected term of the awarded stock option. The Company estimates the risk-free interest rate based upon the U.S. Department of the Treasury yield curve in effect at award grant for time periods that correspond with the expected term of the awarded stock option. The Company’s expected dividend yield is zero because it has never paid cash dividends and does not expect to for the foreseeable future. Prior to the IPO, given the absence of a public trading market, the Company’s Board of Directors, with input from management, considered numerous objective and subjective factors to determine the fair value of its common stock. The factors included: (i) third-party valuations of the Company’s common stock; (ii) the Company’s stage of development; (iii) the status of research and development efforts; (iv) the rights, preferences and privileges of the Company’s preferred stock relative to common stock; (v) the Company’s operating results and financial condition, including the Company’s levels of available capital resources; (vi) equity market conditions affecting comparable public companies; (vii) general U.S. market conditions; and (viii) the lack of current marketability of the Company’s common stock. Subsequent to the IPO, the fair value of the Company’s common stock is based on the closing quoted market price of its common stock as reported by the Nasdaq Global Select Market on the date of grant. All stock-based compensation costs are reported in the Statements of Operations and Comprehensive Income (Loss) within "research and development" expense or "general and administrative" expense, based upon the underlying employee's role within the Company.
Income Taxes	Income Taxes Income taxes are accounted for using the asset and liability method. Deferred tax assets and liabilities are recorded based on the estimated future tax effects of temporary differences between the tax basis of assets and liabilities and amounts reported in the financial statements, as well as operating losses and tax credit carry forwards using enacted tax rates and laws that are expected to be in effect when the differences are expected to reverse. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period of enactment. Realization of deferred tax assets is dependent upon future earnings, the timing and amount of which are uncertain due to the Company’s historical operating performance and recorded cumulative net losses in prior fiscal periods. A valuation allowance is recorded to reduce deferred tax assets, because based upon a weighting of positive and negative factors, it is more likely than not that these deferred tax assets will not be realized. If and when the Company were to determine that deferred tax assets are realizable, an adjustment to the corresponding valuation allowance would increase the net income in the period that such determination was made. In the event that the Company is assessed interest and/or penalties from taxing authorities that have not been previously accrued, such amounts would be included as a component of “income tax expense” within the Statements of Operations and Comprehensive Income (Loss) in the period the notice was received. To date there have been no interest or penalties charged. In December 2019, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2019-12, Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 removes certain exceptions for performing intraperiod tax allocations, recognizing deferred taxes for investments, and calculating income taxes in interim periods. The guidance also simplifies the accounting for franchise taxes, transactions that result in a step-up in the tax basis of goodwill, and the effect of enacted changes in tax laws or rates in interim periods. The Company adopted ASU 2019-12 in the first quarter of 2021 and had no material impact to its financial statements.
Net Loss per Share Attributable to Common Stockholders	Net Income (Loss) per Share Attributable to Common Stockholders Basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period, without the consideration for potential dilutive shares of common stock. Diluted net income (loss) per share is computed by dividing the net loss by the weighted-average number of common stock equivalents outstanding for the period determined using the treasury-stock method and if-converted method, as applicable. The Company’s participating securities include unvested common stock awards issued upon early exercise of certain stock options, as early exercised unvested common stock awards have a non-forfeitable right to dividends. The Company’s participating securities do not have a contractual obligation to share in the Company’s losses, so in periods of net losses, the two-class method of calculating basic and diluted earnings per share is not required. In periods of net income, basic and diluted net loss per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities. In periods of net income, net income is attributed to both common stockholders and participating security holders, and therefore, net income was allocated to common shares and participating securities, as if all of the earnings for the period had been distributed. Diluted earnings per share under the two-class method is calculated using the more dilutive of the treasury stock or the two-class method. Due to a net loss for the three months ended March 31, 2020, all otherwise potentially dilutive securities are antidilutive. Accordingly, basic net loss per share equals diluted net loss per share for the three months ended March 31, 2020.
Fair Value Measurements	Fair Value MeasurementsAssets and liabilities recorded at fair value on a recurring basis in the balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative guidance on fair value measurements establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows: •Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities that are publicly accessible at the measurement date. •Level 2: Observable prices that are based on inputs not quoted on active markets, but that are corroborated by market data. These inputs may include quoted prices for similar assets or liabilities or quoted market prices in markets that are not active to the general public. •Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The carrying amounts for financial instruments consisting of cash and cash equivalents, accounts payable and accrued liabilities approximate fair value due to their short maturities. Derivative instruments (see Note 7) are carried at fair value based on unobservable market inputs.
Comprehensive Income (Loss)	Comprehensive Income (Loss)Comprehensive income (loss) represents all changes in stockholders’ equity (deficit), except those resulting from distributions to stockholders. For all periods presented, comprehensive income (loss) was the same as reported net income (loss).
Recently Issued or Effective Accounting Standards	Recently Issued or Effective Accounting StandardsRecently issued or effective accounting pronouncements that impact, or may have an impact, on the Company’s financial statements have been discussed within the footnote to which each relates. Other recent accounting pronouncements not disclosed in these condensed financial statements have been determined by the Company’s management to have no impact, or an immaterial impact, on its current and expected future financial position, results of operations, or cash flows.

Balance Sheet Account Detail (Tables)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property and equipment, net of accumulated depreciation

“Property and equipment, net of accumulated depreciation” consists of the following:


	March 31, 2021		December 31, 2020
Furniture and fixtures	$	349	$	294
Office equipment	52		74
Lab equipment	167		173
Leasehold improvements	163		141
Property and equipment, at cost	731		682
(Less): Accumulated depreciation and amortization	142		134
Property and equipment, net of accumulated depreciation and amortization	$	589	$	548

Other assets

"Other assets" consists of the following:


	March 31, 2021		December 31, 2020
Deposits	$	27	$	33
Equity warrant rights*	1,233		—
Other long term assets	70		48
Other assets	$	1,330	$	81

Accounts payable and accrued liabilities

“Accounts payable and other accrued liabilities” consists of the following:


	March 31, 2021		December 31, 2020
Trade accounts payable and other	$	4,997	$	2,237

Operating lease liability, current portion	221		282
Accrued clinical studies	3,567		1,524
Income taxes payable	313		—
Employee stock option early exercise liability, current portion	335		304
Accounts payable and other accrued liabilities	$	9,433	$	4,347

Other long-term liabilities

“Other long-term liabilities” consists of the following:


	March 31, 2021		December 31, 2020
Operating lease liability, non-current portion	$	456	$	549
Derivative liability	123		—
Employee stock option early exercise liability, non-current portion	25		56
Other long-term liabilities	$	604	$	605

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Stock details

The following shares of common stock were reserved for issuance:


	March 31, 2021	December 31, 2020

Stock options issued and outstanding	2,448,675	1,836,739
Stock options reserved for future grant	9,790,635	9,414,091
Total shares of common stock reserved	12,239,310	11,250,830

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-based compensation

Stock-based compensation expense for the three months ended March 31, 2021 and 2020 was as follows:


	Three months ended March 31,
	2021		2020
Research and development	$	344	$	1
General and administrative	1,019		3
Total stock-based compensation	$	1,363	$	4

Net Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net loss per share, basis and diluted

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:


	Three Months Ended March 31,
	2021		2020
Basic EPS
Net income (loss)	$	10,376	$	(1,957)
Less: undistributed income allocated to participating securities	90		—
Net income available to common shareholders	$	10,286	$	(1,957)

Basic weighted average shares outstanding	20,336,022		2,650,363
Net income (loss) per share attributable to common stockholders—basic	$	0.51	$	(0.74)

Diluted EPS
Net income (loss)	$	10,376	$	(1,957)
Less: undistributed income reallocated to participating securities	84		—
Net income available to common shareholders	$	10,292	$	(1,957)

Basic weighted average shares outstanding	20,336,022		2,650,363
Effect of dilutive securities:
Common stock options	1,488,552		—
Diluted weighted average shares outstanding	21,824,574		2,650,363
Net income (loss) per share attributable to common stockholders—diluted	$	0.47	$	(0.74)

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Financial instruments measured at fair value


	March 31, 2021 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	156,179	$	—	$	—	$	156,179
Equity warrant rights	—		—		1,233		1,233
Total assets measured at fair value	$	156,179	$	—	$	1,233	$	157,412

	December 31, 2020 Fair Value Measurements
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	168,129	—		—		$	168,129
Total assets measured at fair value	$	168,129	—		—		$	168,129

Commitment & Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Components of lease cost

The components of lease cost were as follows:


	Three months ended March 31,
	2021		2020
Operating lease cost	$	60	$	16
Variable lease cost	60		1
Short-term lease cost	32		—
Total lease cost	$	152	$	17

Future contractual lease payments

The below table summarizes the (i) minimum lease payments over the next five years and thereafter, (ii) lease arrangement imputed interest, and (iii) present value of future lease payments:


Operating Leases - future payments	March 31, 2021
2021 (remaining nine months)	$	199
2022	271
2023	281
2024	25
2025	—
Total future lease payments, undiscounted	$	776
(Less): Imputed interest	(99)
Present value of operating lease payments	$	677

Description of Business and Presentation of Financial Statements (Details) $ / shares in Units, $ in Thousands			3 Months Ended
	Oct. 20, 2020 USD ($) $ / shares shares	Oct. 08, 2020	Mar. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Subsequent Event [Line Items]
Reverse stock split, conversion ratio		0.1346
Accumulated deficit \| $			$ 22,469	$ 32,845
Cash and cash equivalents \| $			$ 156,179	$ 168,129	$ 55,893
Number of reportable segments \| segment			1
IPO
Subsequent Event [Line Items]
Stock issued (shares) \| shares	6,325,000
Price per share (usd per share) \| $ / shares	$ 16.00
Stock issued, net proceeds \| $	$ 91,700
Common stock issued upon conversion of preferred stock (shares) \| shares	11,107,018
Underwriters' option
Subsequent Event [Line Items]
Stock issued (shares) \| shares	825,000

Balance Sheet Account Detail - Property and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 731		$ 682
(Less): Accumulated depreciation and amortization	142		134
Property and equipment, net of accumulated depreciation and amortization	589		548
Depreciation	64	$ 15
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	349		294
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	52		74
Lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	167		173
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 163		$ 141

Balance Sheet Account Detail - Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deposits	$ 27	$ 33
Equity warrant rights*	1,233	0
Other long term assets	70	48
Other assets	$ 1,330	$ 81

Balance Sheet Account Detail - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trade accounts payable and other	$ 4,997	$ 2,237
Operating lease liability, current portion	221	282
Accrued clinical studies	3,567	1,524
Income taxes payable	313	0
Employee stock option early exercise liability, current portion	335	304
Accounts payable and other accrued liabilities	$ 9,433	$ 4,347

Balance Sheet Account Detail - Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease liability, non-current portion	$ 456	$ 549
Derivative liability	123	0
Employee stock option early exercise liability, non-current portion	25	56
Other long-term liabilities	$ 604	$ 605

Stockholders' Equity - Additional Information (Details)	3 Months Ended	6 Months Ended
Stockholders' Equity - Additional Information (Details)	Mar. 31, 2021 vote $ / shares shares	Jun. 30, 2020 $ / shares	Dec. 31, 2020 shares
Class of Stock [Line Items]
Common stock, authorized (shares)	200,000,000		200,000,000
Preferred stock, authorized (shares)	10,000,000.0
Common stock voting rights, number of votes \| vote	1
Common stock dividends declared (usd per share) \| $ / shares	$ 0	$ 0
Common stock, issued (shares)	20,703,849		20,502,576
Common stock, outstanding (shares)	20,524,474		20,323,301

Stockholders' Equity - Shares Reserved for Issuance (Details) - shares	Mar. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Stock options issued and outstanding (shares)	2,448,675	1,836,739
Stock options reserved for future grant (shares)	9,790,635	9,414,091
Total shares of common stock reserved (shares)	12,239,310	11,250,830

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Oct. 20, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved (in shares)	12,239,310	11,250,830
Liability for early exercise of stock options	$ 0.4
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term	10 years
Exercise period from termination upon death	12 months
Exercise period from termination upon disability	6 months
Exercise period from termination upon all other separations	3 months
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved (in shares)			9,000,000
Common stock reserved for issuance, increase percentage on first business day of each of next ten fiscal years	4.00%
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved (in shares)			2,432,980
Minimum exercise price, percent of fair market value of common stock on grant date	100.00%
2016 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service condition period for full vesting	1 year
2016 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service condition period for full vesting	4 years

Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 1,363	$ 4
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	344	1
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 1,019	$ 3

Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic EPS
Net income (loss)	$ 10,376	$ (1,957)
Less: undistributed income allocated to participating securities	90	0
Net income available to common shareholders	$ 10,286	$ (1,957)
Basic weighted average shares outstanding (shares)	20,336,022	2,650,363
Net income (loss) per share attributable to common stockholders - basic (usd per share)	$ 0.51	$ (0.74)
Diluted EPS
Net income (loss)	$ 10,376	$ (1,957)
Less: undistributed income reallocated to participating securities	84	0
Net income available to common shareholders	$ 10,292	$ (1,957)
Basic weighted average shares outstanding (shares)	20,336,022	2,650,363
Effect of dilutive securities:
Common stock options (shares)	1,488,552	0
Diluted weighted average shares outstanding (shares)	21,824,574	2,650,363
Net income (loss) per share attributable to common stockholders - diluted (usd per share)	$ 0.47	$ (0.74)

Net Income (Loss) Per Share - Antidilutive Securities (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income (loss) per share	0.6	2.2
Preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income (loss) per share		8.2

Fair Value Measurements - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Total assets measured at fair value	$ 157,412	$ 168,129
Money market funds
Assets:
Money market funds	156,179	168,129
Equity warrant rights	1,233
Level 1
Assets:
Total assets measured at fair value	156,179	168,129
Level 1 \| Money market funds
Assets:
Money market funds	156,179	168,129
Equity warrant rights	0
Level 2
Assets:
Total assets measured at fair value	0	0
Level 2 \| Money market funds
Assets:
Money market funds	0	0
Equity warrant rights	0
Level 3
Assets:
Total assets measured at fair value	1,233	0
Level 3 \| Money market funds
Assets:
Money market funds	0	$ 0
Equity warrant rights	$ 1,233

Commitment & Contingencies - Facility Leases (Details) $ in Thousands		1 Months Ended
	Jun. 01, 2020 USD ($)	Dec. 31, 2020 USD ($) contract	Mar. 31, 2021 USD ($) contract	Jan. 31, 2021
Lessee, Lease, Description [Line Items]
Lease term				6 months
Impairment of operating lease right-of-use asset		$ 15
Operating lease right-of-use asset obtained in exchange for operating lease liability	$ 700
Weighted average remaining lease term		2 years 10 months	2 years 10 months
Estimated incremental borrowing rate			10.00%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2021 (remaining nine months)			$ 199
2022			271
2023			281
2024			25
2025			0
Total future lease payments, undiscounted			776
(Less): Imputed interest			(99)
Present value of operating lease payments			$ 677
Irvine office and laboratory facility
Lessee, Lease, Description [Line Items]
Number of leases \| contract		3
Other facility leases
Lessee, Lease, Description [Line Items]
Number of leases not impaired \| contract			2

Commitment & Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 60	$ 16
Variable lease cost	60	1
Short-term lease cost	32	0
Total lease cost	$ 152	$ 17

Commitment & Contingencies - In-License Agreementd for Lotilaner (Details) - USD ($)		1 Months Ended		3 Months Ended
	Sep. 03, 2020	Sep. 30, 2020	Jan. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development				$ 16,261,000	$ 1,512,000
Common stock issued for license agreement, value				5,494,000	$ 0
License agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development		$ 1,000,000.0	$ 1,000,000.0	$ 2,000,000.0
Common stock issued for license agreement (shares)		222,460
Common stock issued for license agreement, value		$ 3,100,000
Common stock issued for license agreement, share price (usd per share)				$ 14.0003
Additional shares to be issued upon 18-month anniversary of contract execution (shares)		187,500
Additional shares to be issued upon 18-month anniversary of contract execution, value	$ 5,500,000
Additional shares to be issued upon 18-month anniversary of contract execution, share price (usd per share)		$ 29.30
License agreement \| Clinical milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments			3,000,000.0	$ 4,500,000
License agreement \| Commercial and sales milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments			$ 79,000,000.0	$ 77,000,000.0

Commitment & Contingencies - Employment Arrangements (Details)	Mar. 31, 2021 arrangement
Commitments and Contingencies Disclosure [Abstract]
Number of employment arrangements with executive officers	6

Out-License Agreement (Details) - USD ($)	1 Months Ended		3 Months Ended
Out-License Agreement (Details) - USD ($)	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues			$ 33,432,000	$ 0
License fees
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues			33,311,000	0
Collaboration
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues			121,000	$ 0
LianBio \| License agreement \| Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment received	$ 10,000,000.0
LianBio \| License agreement \| Regulatory Milestone
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments			75,000,000.0
LianBio \| License agreement \| Sales Milestone
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments			100,000,000.0
LianBio \| License agreement \| License fees
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues			33,300,000
LianBio \| License agreement \| Collaboration
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues			$ 100,000
LianBio \| Subsequent Event \| License agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment received		$ 15,000,000.0

Label	Element	Value
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 20,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 20,000