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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy for Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis | 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 |
Summary of Changes in Fair Value of Level 3 Derivative Liability | 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 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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