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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 Company values its available-for-sale debt securities and certain liabilities based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In order to increase consistency and comparability in fair value measurements, a fair value hierarchy that prioritizes observable and unobservable inputs is used to measure fair value into three broad levels, which are described below: Level 1 – Quoted prices (unadjusted) in active markets that are accessible at the measurement date for identical assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in inactive markets or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data. Level 3 – Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs to the extent possible. In addition, the Company considers counterparty credit risk in its assessment of fair value. The asset or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. The following is a description of the valuation methodologies used for assets and liabilities measured at fair value. Corporate bonds – Valued at the closing price reported on the active market on which the individual securities, all of which have counterparts with high credit ratings, are traded. Commercial paper – Value is based on yields currently available on comparable securities of issuers with similar credit ratings. Money market funds – Valued at the net asset value (“NAV”) of units of a collective fund. The NAV is used as a practical expedient to estimate fair value. This practical expedient is not used when it is determined to be probable that the fund will sell the investment for an amount different than the reported NAV. Warrant liabilities – Valued based on significant inputs not observed in the market and, thus, represents a Level 3 measurement. The Company estimated the fair value of the liability using the Black-Scholes option pricing model and the change in fair value was recognized in general and administrative expenses. Refer to Note 11 for further information. The contractual maturities of investments classified as marketable debt securities are as follows as of June 30, 2021 and December 31, 2020:
| June 30, 2021 |  | December 31, 2020
Due within 1 year | $ | 37,826 |  |  | $ | 37,813 |
Total marketable debt securities | $ | 37,826 |  |  | $ | 37,813 |
| Fair Value as of June 30, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Commercial paper | $ | — |  |  | $ | 16,691 |  |  | $ | — |  |  | $ | 16,691 |
U.S. Treasuries | 15,969 |  |  | — |  |  | — |  |  | 15,969 |
Corporate bonds | — |  |  | 1,752 |  |  | — |  |  | 1,752 |
Total assets in the fair value hierarchy | 15,969 |  |  | 18,443 |  |  | — |  |  | 34,412 |
Money market funds measured at NAV(a) | — |  |  | — |  |  | — |  |  | 3,414 |
Total investments at fair value | $ | 15,969 |  |  | $ | 18,443 |  |  | $ | — |  |  | $ | 37,826 |
Warrant liabilities | — |  |  | — |  |  | — |  |  | — |
Total warrant liabilities at fair value | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Fair Value as of December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Commercial paper | $ | — |  |  | $ | 11,932 |  |  | $ | — |  |  | $ | 11,932 |
U.S. Treasuries | 5,380 |  |  | — |  |  | — |  |  | 5,380 |
Corporate bonds | — |  |  | 20,444 |  |  | — |  |  | 20,444 |
Total assets in the fair value hierarchy | 5,380 |  |  | 32,376 |  |  | — |  |  | 37,756 |
Money market funds measured at NAV(a) | — |  |  | — |  |  | — |  |  | 57 |
Total investments at fair value | $ | 5,380 |  |  | $ | 32,376 |  |  | $ | — |  |  | $ | 37,813 |
Warrant liabilities | $ | — |  |  | $ | — |  |  | $ | (17,740) |  |  | $ | (17,740) |
Total warrant liabilities at fair value | $ | — |  |  | $ | — |  |  | $ | (17,740) |  |  | $ | (17,740) |
____________________________ (a)Certain money market funds that were measured at NAV per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line items presented in the consolidated balance sheets. The following table provides a summary of changes in fair value of the Company’s Level 3 warrant liabilities for the six months ended June 30, 2021 and 2020:
| 2021 |  | 2020
Balance as of January 1 | $ | (17,740) |  |  | $ | (16,853) |
Warrants issued | (289) |  |  | — |
Issuance of equity upon exercise of certain warrants | 30,206 |  |  | — |
Issuance of equity upon settlement of certain warrants | 619 |  |  | — |
Fair value adjustments | (12,796) |  |  | — |
Balance as of June 30 | $ | — |  |  | $ | (16,853) |
See Note 11 for further information regarding these Level 3 fair value measurements. For certain other financial instruments, including accounts receivable, accounts payable, accrued liabilities, as well as other current liabilities, the carrying amounts approximate the fair value of such instruments due to the short maturity of these balances.

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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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