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Fair Value Measurements and Short-Term Investments - Reconciliation of Fair Value Measurement of Contingent Royalty Obligation Payable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period $ 41,546 $ 44,683
Payments (3,097) (1,130)
Change in fair value recorded in operating expenses 6,290 (2,007)
Fair value, end of period $ 44,740 $ 41,546