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Marketable Securities | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities The following table summarizes the marketable securities held as of March 31, 2021 (in thousands):
| Amortized cost |  | Unrealized gains |  | Unrealized losses |  | Fair value
March 31, 2021 |  |  |  |  |  |  |
Corporate bonds | $ | 2,032 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 2,031 |
Commercial paper | 20,374 |  |  | — |  |  | — |  |  | 20,374 |
Total | $ | 22,406 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 22,405 |
All marketable securities held at March 31, 2021 had maturities of less than 12 months when purchased and are classified as short-term marketable securities on the accompanying consolidated balance sheet. During the three months ended March 31, 2021, there were no marketable securities adjusted for other than temporary declines in fair value. As of December 31, 2020, the Company held no marketable securities.

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