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Cash and Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments |
| As of December 31, 2019 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |  |  |
Cash and cash equivalents | $ | 36,112 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,112 |
Securities maturing within one year: |  |  |  |  |  |  |
U.S. treasury securities | 235,463 |  |  | 94 |  |  | (10) |  |  | 235,547 |
Total short-term investments | $ | 235,463 |  |  | $ | 94 |  |  | $ | (10) |  |  | $ | 235,547 |
Total cash and cash equivalents and investments | $ | 271,575 |  |  | $ | 94 |  |  | $ | (10) |  |  | $ | 271,659 |
| As of December 31, 2018 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |  |  |
Cash and cash equivalents | $ | 80,386 |  |  | $ | — |  |  | $ | — |  |  | $ | 80,386 |
Securities maturing within one year: |  |  |  |  |  |  |
U.S. treasury securities | 73,983 |  |  | — |  |  | (9) |  |  | 73,974 |
Corporate debt securities | 5,695 |  |  | — |  |  | (3) |  |  | 5,692 |
Total short-term investments | $ | 79,678 |  |  | $ | — |  |  | $ | (12) |  |  | $ | 79,666 |
Total cash and cash equivalents and investments | $ | 160,064 |  |  | $ | — |  |  | $ | (12) |  |  | $ | 160,052 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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