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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 36,917 | $ 48,088
Revenue-based royalty | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | 4,545 | 7,710
Revenue milestones | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | 46,305 | 66,114
Regulatory approval | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 4,900 | $ 2,885
Discount rate | Revenue-based royalty | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.12 | 0.13
Discount rate | Revenue-based royalty | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.15 | 0.24
Discount rate | Revenue-based royalty | Weighted Average | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.135 |
Discount rate | Revenue milestones | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.075 | 0.09
Discount rate | Revenue milestones | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.12 | 0.135
Discount rate | Revenue milestones | Weighted Average | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.090 |
Discount rate | Regulatory approval | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.01 | 0.024
Probability of milestone payment | Regulatory approval | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 1 | 0.65

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