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Cash, Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2020
Cash, Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
| As of September 30, 2020
|  |  | Gross |  | Gross |  |
| Amortized |  | unrealized |  | unrealized |  | Fair
| Cost |  | gains |  | losses |  | Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 41,784 |  | $ | — |  | $ | — |  | $ | 41,784
Commercial paper |  | 24,243 |  |  | 1 |  |  | — |  |  | 24,244
U.S. Treasury security |  | 3,000 |  |  | — |  |  | — |  |  | 3,000
Total cash and cash equivalents |  | 69,027 |  |  | 1 |  |  | — |  |  | 69,028
Investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 105,377 |  |  | 12 |  |  | (9) |  |  | 105,380
Corporate debt securities |  | 21,081 |  |  | 119 |  |  | (5) |  |  | 21,195
U.S. government & agency securities |  | 10,097 |  |  | 1 |  |  | (1) |  |  | 10,097
U.S. Treasury security |  | 2,850 |  |  | — |  |  | — |  |  | 2,850
Total investments |  | 139,405 |  |  | 132 |  |  | (15) |  |  | 139,522
Total cash, cash equivalents and investments | $ | 208,432 |  | $ | 133 |  | $ | (15) |  | $ | 208,550
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,500 |  | $ | — |  | $ | — |  | $ | 3,500
| As of December 31, 2019
|  |  | Gross |  | Gross |  |
| Amortized |  | unrealized |  | unrealized |  | Fair
| Cost |  | gains |  | losses |  | Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 18,644 |  | $ | — |  | $ | — |  | $ | 18,644
Commercial paper |  | 10,983 |  |  | — |  |  | — |  |  | 10,983
Total cash and cash equivalents |  | 29,627 |  |  | — |  |  | — |  |  | 29,627
Investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 16,971 |  |  | 1 |  |  | (1) |  |  | 16,971
Corporate debt securities |  | 2,496 |  |  | 5 |  |  | — |  |  | 2,501
Total investments |  | 19,467 |  |  | 6 |  |  | (1) |  |  | 19,472
Total cash, cash equivalents and investments | $ | 49,094 |  | $ | 6 |  | $ | (1) |  | $ | 49,099
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 4,000 |  | $ | — |  | $ | — |  | $ | 4,000
Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments |
| Fair Value
Due in one year or less | $ | 152,858
Due after one year through 5 years |  | 13,908
Total investments | $ | 166,766

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