Acquisitions - Semma Therapeutics - Additional Information (Details) - USD ($) |
Oct. 10, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Intangible asset | $ 400,000,000.0 | $ 0 | |
| Semma Therapeutics, Inc. | |||
| Business Acquisition [Line Items] | |||
| Total purchase price | $ 936,764,000 | ||
| Pre-Clinical Treatments For Device-Assisted Cells | Semma Therapeutics, Inc. | |||
| Business Acquisition [Line Items] | |||
| Intangible asset | 379,000,000.0 | ||
| Naked Islets | Semma Therapeutics, Inc. | |||
| Business Acquisition [Line Items] | |||
| Intangible asset | $ 8,000,000.0 |