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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Investments Classified by Contractual Maturity Date | 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 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis |
| 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.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | 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) |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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