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Short-term Investments | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Short-term Investments | Short-term Investments The Company's investments are classified as available-for-sale. The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of June 30, 2020:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value
U.S. government debt securities | $ | 85,749 |  |  | $ | 279 |  |  | $ | — |  |  | $ | 86,028 |
Certificates of deposit | 264 |  |  | — |  |  | — |  |  | 264 |
Total | $ | 86,013 |  |  | $ | 279 |  |  | $ | — |  |  | $ | 86,292 |
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
U.S. government debt securities | $ | 8,989 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 8,996 |
Certificates of deposit | 264 |  |  | — |  |  | — |  |  | 264 |
Total | $ | 9,253 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 9,260 |
As of June 30, 2020, all of the available-for-sale investments were due within one year based on their contractual maturities. Changes in market interest rates and bond yields cause certain investments to fall below their cost basis, resulting in unrealized losses on investments. None of the Company's debt security investments were in an unrealized loss position as of June 30, 2020.

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