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Fair Value Measurements - Summary of Changes in Estimated Fair Value of Financial Liabilities (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Mar. 10, 2020 | Sep. 30, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Reclassification of derivative liability to additional paid-in capital upon achievement of development milestone | $ 29,200 |
Level 3 |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2019 |  | $ 30,029
Changes in fair value |  | 61,228
Payment of contingent consideration related to Humabs acquisition |  | (10,000)
Reclassification of derivative liability to additional paid-in capital upon achievement of development milestone |  | (29,245)
Balance at September 30, 2020 |  | 52,012
Level 3 | Contingent Consideration |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2019 |  | 17,580
Changes in fair value |  | 44,432
Payment of contingent consideration related to Humabs acquisition |  | (10,000)
Balance at September 30, 2020 |  | 52,012
Level 3 | Derivative Liability |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2019 |  | 12,449
Changes in fair value |  | 16,796
Reclassification of derivative liability to additional paid-in capital upon achievement of development milestone |  | $ (29,245)

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