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Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Organization and Significant Accounting Policies |
Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​
(in thousands) | ​ | January 1,
At beginning of period: | ​ | 2022 |  | 2021 |  | 2020
Cash and cash equivalents | ​ | $ | 417,195 | ​ | $ | 541,158 | ​ | $ | 177,668
Restricted cash | ​ | ​ | 440 | ​ | ​ | 440 | ​ | ​ | 240
Total cash, cash equivalents and restricted cash | ​ | $ | 417,635 | ​ | $ | 541,598 | ​ | $ | 177,908
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
At end of period: | ​ | 2022 | ​ | 2021 | ​ | 2020
Cash and cash equivalents | ​ | $ | 63,547 | ​ | $ | 417,195 | ​ | $ | 541,158
Restricted cash | ​ |  | 440 | ​ |  | 440 | ​ |  | 440
Total cash, cash equivalents and restricted cash | ​ | $ | 63,987 | ​ | $ | 417,635 | ​ | $ | 541,598
​
Schedule of Estimated Useful Lives of Property Plant and Equipment | ​
​ | ​ | ​
Computer equipment and software |  | 3 - 7 years
Furniture and fixtures |  | 5 years
Machinery and equipment |  | 5 years
Leasehold improvements |  | Shorter of lease term or useful life
​

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