Leases - Supplemental Cash Flow Information (Details) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
USD ($)
| |
| Cash paid for amounts included in the measurement of lease liabilities: | |
| Operating cash flows from operating leases | $ 10,650 |
| Operating cash flows from finance leases | 50,527 |
| Financing cash flows from finance leases | 39,185 |
| Right-of-use assets obtained in exchange for lease obligations | |
| Operating leases | 34,605 |
| Finance leases | 0 |
| Semma and Exonics Therapeutics | |
| Right-of-use assets obtained in exchange for lease obligations | |
| Operating leases | $ 33,700 |