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Fair Value Measurements - Estimated Fair Value of Significant Unobservable Inputs (Details) | Sep. 30, 2020 | Dec. 31, 2019
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Humabs | Clinical and Regulatory Milestones | Measurement Input, Discount Rate | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input |  | 0.10 | [1] | 0.077
Humabs | Clinical and Regulatory Milestones | Measurement Input, Discount Rate | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input |  | 0.12 | [1] | 0.111
Humabs | Clinical and Regulatory Milestones | Measurement Input, Discount Rate | Weighted Average |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [1] | 0.10 |  |
Humabs | Clinical and Regulatory Milestones | Probability of Achievement | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [1] | 0.14 |  |
Humabs | Clinical and Regulatory Milestones | Probability of Achievement | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [1] | 1.00 |  |
Humabs | Clinical and Regulatory Milestones | Probability of Achievement | Weighted Average |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [1] | 0.56 |  |
Humabs | Commercial Milestones | Measurement Input, Discount Rate |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input |  | 0.11 | [2] | 0.13
Humabs | Commercial Milestones | Probability of Achievement | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [2] | 0.14 |  |
Humabs | Commercial Milestones | Probability of Achievement | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [2] | 0.32 |  |
Humabs | Commercial Milestones | Probability of Achievement | Weighted Average |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [2] | 0.30 |  |
Humabs | Commercial Milestones | Measurement Input Expected Revenue Volatility |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input |  | 0.60 | [2] | 0.55
TomegaVax | Measurement Input, Discount Rate | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [3] | 0.000 |  |
TomegaVax | Measurement Input, Discount Rate | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [3] | 0.002 |  |
TomegaVax | Measurement Input, Discount Rate | Weighted Average |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [3] | 0.001 |  |
TomegaVax | Expected Stock Price Volatility |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value contingent consideration measurement input | [3] | 0.85 |  |
[1] | Unobservable inputs were weighted based on the relative fair value of the clinical and regulatory milestone payments.
[2] | Unobservable inputs were weighted based on the relative fair value of the commercial milestone payments
[3] | Unobservable inputs were weighted based on the relative fair value of the underlying milestones.

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