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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Fair Value, Inputs, Level 3 | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Revenue-based royalty |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 4,804,000 | $ 7,710,000
Revenue milestones |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | 55,561,000 | 66,114,000
Regulatory approval |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration liabilities | $ 4,300,000 | $ 2,885,000
Discount rate | Revenue-based royalty | Minimum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.13 | 0.13
Discount rate | Revenue-based royalty | Maximum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.20 | 0.24
Discount rate | Revenue-based royalty | Weighted Average | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.136 |
Discount rate | Revenue milestones | Minimum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.11 | 0.09
Discount rate | Revenue milestones | Maximum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.14 | 0.135
Discount rate | Revenue milestones | Weighted Average | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.124 |
Discount rate | Regulatory approval | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.027 | 0.024
Probability of milestone payment | Regulatory approval | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs, contingent liability | 0.90 | 0.65

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