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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 15,677 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,677 |
Corporate debt securities |  |  | — |  |  |  | 2,500 |  |  |  | — |  |  |  | 2,500 |
Commercial paper |  |  | — |  |  |  | 13,499 |  |  |  | — |  |  |  | 13,499 |
Total cash equivalents |  |  | 15,677 |  |  |  | 15,999 |  |  |  | — |  |  |  | 31,676 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | — |  |  |  | 11,588 |  |  |  | — |  |  |  | 11,588 |
Commercial paper |  |  | — |  |  |  | 50,027 |  |  |  | — |  |  |  | 50,027 |
Total short-term investments |  |  | — |  |  |  | 61,615 |  |  |  | — |  |  |  | 61,615 |
Total assets measured at fair value |  | $ | 15,677 |  |  | $ | 77,614 |  |  | $ | — |  |  | $ | 93,291 |
|  | December 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 12,859 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,859 |
Corporate debt securities |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | 500 |
Total cash equivalents |  |  | 12,859 |  |  |  | 500 |  |  |  | — |  |  |  | 13,359 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency bonds |  |  | — |  |  |  | 2,750 |  |  |  | — |  |  |  | 2,750 |
Corporate debt securities |  |  | — |  |  |  | 11,349 |  |  |  | — |  |  |  | 11,349 |
Commercial paper |  |  | — |  |  |  | 5,987 |  |  |  | — |  |  |  | 5,987 |
Total short-term investments |  |  | — |  |  |  | 20,086 |  |  |  | — |  |  |  | 20,086 |
Total assets measured at fair value |  | $ | 12,859 |  |  | $ | 20,586 |  |  | $ | — |  |  | $ | 33,445 |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock tranche obligation |  | $ | — |  |  | $ | — |  |  | $ | 2,158 |  |  | $ | 2,158 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 2,158 |  |  | $ | 2,158 |
Summary of Company's Financial Assets Measured at Fair Value | The following tables present information as to cost, unrealized gains and losses and fair value determination of the Company’s financial assets measured at fair value on a recurring basis (in thousands):
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Aggregate Fair Value |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 15,677 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,677 |
Corporate debt securities |  |  | 2,502 |  |  |  | — |  |  |  | (2 | ) |  |  | 2,500 |
Commercial paper |  |  | 13,498 |  |  |  | 1 |  |  |  | — |  |  |  | 13,499 |
Total cash equivalents |  |  | 31,677 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 31,676 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | 11,588 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 11,588 |
Commercial paper |  |  | 50,030 |  |  |  | 2 |  |  |  | (5 | ) |  |  | 50,027 |
Total short-term investments |  |  | 61,618 |  |  |  | 3 |  |  |  | (6 | ) |  |  | 61,615 |
Total assets measured at fair value |  | $ | 93,295 |  |  | $ | 4 |  |  | $ | (8 | ) |  | $ | 93,291 |
|  | December 31, 2019 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Aggregate Fair Value |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 12,859 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,859 |
Corporate debt securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total cash equivalents |  |  | 13,359 |  |  |  | — |  |  |  | — |  |  |  | 13,359 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency bonds |  |  | 2,750 |  |  |  | — |  |  |  | — |  |  |  | 2,750 |
Corporate debt securities |  |  | 11,348 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 11,349 |
Commercial paper |  |  | 5,985 |  |  |  | 2 |  |  |  | — |  |  |  | 5,987 |
Total short-term investments |  |  | 20,083 |  |  |  | 4 |  |  |  | (1 | ) |  |  | 20,086 |
Total assets measured at fair value |  | $ | 33,442 |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 33,445 |
Summary of Reconciliation of Level 3 Liabilities Measured at Fair Value | The following table provides a reconciliation of Level 3 liabilities measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
|  | Amount |
Fair value as of December 31, 2019 |  | $ | 2,158 |
Change in fair value and expiration of the preferred stock tranche obligation |  |  | (2,158 | )
Balance as of December 31, 2020 |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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=117815213&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=117815213&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=117815213&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=117815213&loc=d3e19207-110258 + Details
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