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Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investments | The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2020:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value
United States government debt securities | $ | 48,048 |  |  | $ | 14 |  |  | $ | (1) |  |  | $ | 48,061 |
Certificates of deposit | 264 |  |  | — |  |  | — |  |  | 264 |
Total | $ | 48,312 |  |  | $ | 14 |  |  | $ | (1) |  |  | $ | 48,325 |
The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2019:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value
United States government debt securities | $ | 8,989 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 8,996 |
Certificates of deposit | 264 |  |  | — |  |  | — |  |  | 264 |
Total | $ | 9,253 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 9,260 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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