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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 3. Fair Value Measurements The following tables represent the Company’s fair value hierarchy for financial assets and financial liabilities measured at fair value on a recurring basis as of December 31, 2021 and 2020 (in thousands):
|  | Basis for Fair Value Measurements |  |  | Fair Value as of |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | December 31, 2021 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 36,556 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,556 |
Commercial paper |  |  | — |  |  |  | 37,535 |  |  |  | — |  |  |  | 37,535 |
Corporate bonds |  |  | — |  |  |  | 94,864 |  |  |  | — |  |  |  | 94,864 |
US Treasuries |  |  | — |  |  |  | 30,029 |  |  |  | — |  |  |  | 30,029 |
Total |  | $ | 36,556 |  |  | $ | 162,428 |  |  | $ | — |  |  | $ | 198,984 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  | $ | — |  |  | $ | — |  |  | $ | 214 |  |  | $ | 214 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 214 |  |  | $ | 214 |
|  | Basis for Fair Value Measurements |  |  | Fair Value as of |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | December 31, 2020 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 276,726 |  |  | $ | — |  |  | $ | — |  |  | $ | 276,726 |
Total |  | $ | 276,726 |  |  | $ | — |  |  | $ | — |  |  | $ | 276,726 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  | $ | — |  |  | $ | — |  |  | $ | 122 |  |  | $ | 122 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 122 |  |  | $ | 122 |
Level 3 Inputs The fair value of the derivative liability is based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The fair value of the derivative liability was determined using a present value analysis with multiple scenarios. In determining the fair value of the derivative liability, the inputs impacting fair value include the change of control payment to CFF, the probability of a change of control event, the product status at time of a change of control event and the discount rate. See Note 16 for further discussion on embedded derivative. There were no transfers between Level 1, 2 and 3 during the periods presented. The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 derivative liability (in thousands):
Balance as of December 31, 2019 |  | $ | 101 |
Change in fair value included in other income (expense), net |  |  | 21 |
Balance as of December 31, 2020 |  | $ | 122 |
Change in fair value included in other income (expense), net |  |  | 92 |
Balance as of December 31, 2021 |  | $ | 214 |

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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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