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Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 4. Marketable Securities Marketable securities, which are classified as available-for-sale, consisted of the following as of December 31, 2021 (in thousands):
|  | Amortized Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value as of December 31, 2021 |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 32,471 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 32,467 |
Corporate bonds |  |  | 57,315 |  |  |  | — |  |  |  | (79 | ) |  |  | 57,236 |
US Treasuries |  |  | 5,082 |  |  |  | — |  |  |  | (9 | ) |  |  | 5,073 |
Total short-term marketable securities |  | $ | 94,868 |  |  | $ | — |  |  | $ | (92 | ) |  | $ | 94,776 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 5,089 |  |  | $ | — |  |  | $ | (21 | ) |  | $ | 5,068 |
Corporate bonds |  |  | 37,821 |  |  |  | — |  |  |  | (193 | ) |  |  | 37,628 |
US Treasuries |  |  | 25,073 |  |  |  | — |  |  |  | (117 | ) |  |  | 24,956 |
Total long-term marketable securities |  | $ | 67,983 |  |  | $ | — |  |  | $ | (331 | ) |  | $ | 67,652 |
All marketable securities held as of December 31, 2021, had contractual maturities of less than two years. There have been no realized gains or losses on marketable securities for the periods presented. None of the Company's investments in marketable securities has been in an unrealized loss position for more than one year. The Company determined that it has the ability and intent to hold all marketable securities that have been in a continuous loss position until maturity or recovery, thus there has been no recognition of any other-than-temporary impairment in the year ended December 31, 2021. As of December 31, 2020, the Company had no marketable securities.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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