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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Summary of Financial Assets Carried at Fair Value and Measured on Recurring Basis | Financial assets carried at fair value and measured on a recurring basis as of December 31, 2020 are classified in the hierarchy as follows (in thousands):
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 286 |  |  | $ | 286 |  |  | $ | — |  |  | $ | — |
Total cash equivalents |  |  | 286 |  |  |  | 286 |  |  |  | — |  |  |  | — |
Available-for-sale investments |  |  |  |  |  |  |  |  |  |  |  |
U.S. corporate debt securities |  |  | 858 |  |  |  | — |  |  |  | 858 |  |  |  | — |
Foreign corporate debt securities |  |  | 953 |  |  |  | — |  |  |  | 953 |  |  |  | — |
Total available-for-sale investments |  |  | 1,811 |  |  |  | — |  |  |  | 1,811 |  |  |  | — |
Total financial assets carried at fair value |  | $ | 2,097 |  |  | $ | 286 |  |  | $ | 1,811 |  |  | $ | — |

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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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