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Assets and Liabilities Measured at Fair Value - Level 3 Roll Forward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of the period $ 13,005 $ 19,266 $ 21,417 $ 20,339
Changes in fair value during the period, included in the Consolidated Statements of Operations (1,995) (567) (2,583) 506
Milestone paid or payable in cash (15,000) 0 (24,000) 0
Balance, end of the period $ 0 $ 19,833 $ 0 $ 19,833