Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands |
1 Months Ended | 12 Months Ended | |
---|---|---|---|
Aug. 31, 2018 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Property, Plant and Equipment [Line Items] | |||
Estimated useful life of assets | 10 years | ||
Accrued research and development services current | $ 21,962 | $ 29,033 | |
Accrued compensation and benefits current | 6,200 | 9,644 | |
Operating Lease, Liability, Current | 553 | 553 | |
Other Accrued Liabilities, Current | 976 | 2,921 | |
Accrued Liabilities | $ 29,691 | $ 42,151 | |
Minimum | |||
Property, Plant and Equipment [Line Items] | |||
Estimated useful life of assets | 3 years | ||
Maximum | |||
Property, Plant and Equipment [Line Items] | |||
Estimated useful life of assets | 40 years |