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Fair Value Measurements | 6 Months Ended
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Jun. 30, 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)):
| June 30, 2021 Fair Value Measurements
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Money market funds | $ | 176,710 |  |  | $ | — |  |  | $ | — |  |  | $ | 176,710 |
Equity warrant rights | — |  |  | — |  |  | 1,076 |  |  | 1,076 |
Total assets measured at fair value | $ | 176,710 |  |  | $ | — |  |  | $ | 1,076 |  |  | $ | 177,786 |
| 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 equity securities of LianBio, a privately-held China-focused pharmaceutical company, at fair value (on a per share basis at the time of issuance). The warrants 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 discrete clinical and regulatory milestones for the vesting of each of the three warrants. As of June 30, 2021, one of these three milestones was met for vesting of the respective warrant. 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 June 30, 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. The following table sets forth a summary of the changes in fair value of the equity warrant rights presented in "other assets" on the accompanying Condensed Balance Sheets. The measurement of the equity warrant rights represents a Level 3 financial instrument:
| Equity Warrant Rights, presented in "other assets" within the Condensed Consolidated Balance Sheets
Fair value as of December 31, 2020 | $ | — |
Initial fair value estimate of equity warrant rights upon issuance | 1,233 |
Fair value as of March 31, 2021 | $ | 1,233 |
Revaluation of equity warrant rights upon achievement of first development milestone, included in "license fees" within the Condensed Statement of Operations for the three months ended June 30, 2021 | 719 |
Revaluation of equity warrant rights included in "other income (expense), net" within the Condensed Statement of Operations for the three months ended June 30, 2021 | (876) |
Fair value as of June 30, 2021 | $ | 1,076 |

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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