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Cash and Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2020
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of September 30, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 52,251 |  |  | $ | — |  |  | $ | — |  |  | $ | 52,251 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 38,796 |  |  | 40 |  |  | — |  |  | 38,836 |
Corporate debt securities |  | 20,364 |  |  | 1 |  |  | (6) |  |  | 20,359 |
Total short-term investments |  | $ | 59,160 |  |  | $ | 41 |  |  | $ | (6) |  |  | $ | 59,195 |
Total cash and cash equivalents and investments |  | $ | 111,411 |  |  | $ | 41 |  |  | $ | (6) |  |  | $ | 111,446 |
|  | 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 |

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- Definition Cash and Cash Equivalents and Investments [Abstract] + References No definition available. + Details
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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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