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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Fair Value, Inputs, Level 3 $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Revenue-based royalty |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 3,560 | $ 4,545
Revenue milestones |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | 41,051 | 46,305
Regulatory approval |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 3,872 | $ 4,900
Discount rate | Revenue-based royalty | Minimum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.14 | 0.12
Discount rate | Revenue-based royalty | Maximum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.16 | 0.15
Discount rate | Revenue-based royalty | Weighted Average | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.153 | 0.135
Discount rate | Revenue milestones | Minimum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.105 | 0.075
Discount rate | Revenue milestones | Maximum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.14 | 0.12
Discount rate | Revenue milestones | Weighted Average | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.106 | 0.090
Discount rate | Regulatory approval | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.01 | 0.01
Probability of milestone payment | Regulatory approval | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.80 | 1

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