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Cash and Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of September 30, 2021
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 92,118 |  |  | $ | — |  |  | $ | — |  |  | $ | 92,118 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 15,123 |  |  | 1 |  |  | — |  |  | 15,124 |
Corporate debt securities |  | 13,683 |  |  | — |  |  | (7) |  |  | 13,676 |
Total short-term investments |  | $ | 28,806 |  |  | $ | 1 |  |  | $ | (7) |  |  | $ | 28,800 |
Total cash and cash equivalents and investments |  | $ | 120,924 |  |  | $ | 1 |  |  | $ | (7) |  |  | $ | 120,918 |
|  | As of December 31, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  |  | (in thousands) |  |
Cash and cash equivalents |  | $ | 126,263 |  |  | $ | — |  |  | $ | — |  |  | $ | 126,263 |
Securities maturing within one year: |  |  |  |  |  |  |  |
Corporate debt securities |  | 26,018 |  |  | 5 |  |  | (11) |  |  | 26,012 |
Total short-term investments |  | $ | 26,018 |  |  | $ | 5 |  |  | $ | (11) |  |  | $ | 26,012 |
Total cash and cash equivalents and investments |  | $ | 152,281 |  |  | $ | 5 |  |  | $ | (11) |  |  | $ | 152,275 |

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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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