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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments (Tables) | 9 Months Ended
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Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Investments |
|  | September 30, 2022
(in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Cash, cash equivalents and restricted cash |  | $ | 86,052 |  |  | $ | — |  |  | $ | — |  |  | $ | 86,052 |
U.S. agency security |  | 4,900 |  |  | 4 |  |  | — |  |  | 4,904 |
Corporate bond |  | 98,448 |  |  | — |  |  | (380) |  |  | 98,068 |
Commercial paper |  | 112,833 |  |  | — |  |  | (200) |  |  | 112,633 |
Treasury bill |  | 26,721 |  |  | — |  |  | (17) |  |  | 26,704 |
Treasury bond |  | 44,670 |  |  | — |  |  | (117) |  |  | 44,553 |
Yankee bond |  | 3,742 |  |  | — |  |  | (12) |  |  | 3,730 |
Total cash, cash equivalents, restricted cash and short-term investments |  | $ | 377,366 |  |  | $ | 4 |  |  | $ | (726) |  |  | $ | 376,644 |
|  | December 31, 2021
(in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Cash, cash equivalents and restricted cash |  | $ | 231,900 |  |  | $ | — |  |  | $ | — |  |  | $ | 231,900 |
Certificates of deposit |  | 3,144 |  |  | — |  |  | (4) |  |  | 3,140 |
Corporate bond |  | 2,592 |  |  | — |  |  | (1) |  |  | 2,591 |
Commercial paper |  | 206,764 |  |  | — |  |  | (40) |  |  | 206,724 |
Treasury bill |  | 2,497 |  |  | — |  |  | (2) |  |  | 2,495 |
Total |  | $ | 446,897 |  |  | $ | — |  |  | $ | (47) |  |  | $ | 446,850 |
Total held to maturity securities at amortized cost |  |  |  |  |  |  |  | 19,228 |
Total cash, cash equivalents, restricted cash and short-term investments |  |  |  |  |  |  |  | $ | 466,078 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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