Property and Equipment - Narrative (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Property, Plant and Equipment [Line Items] | ||
| Impairment charge | $ 16,838,000 | |
| Depreciation | 38,192,000 | $ 16,779,000 |
| Gain (loss) on disposal of assets | 0 | |
| Leasehold improvements and furniture fixtures | ||
| Property, Plant and Equipment [Line Items] | ||
| Depreciation | $ 40,457,000 | |
| Leasehold improvements and furniture fixtures | Minimum | ||
| Property, Plant and Equipment [Line Items] | ||
| Useful life (in years) | 2 years | |
| Leasehold improvements and furniture fixtures | Maximum | ||
| Property, Plant and Equipment [Line Items] | ||
| Useful life (in years) | 3 years | |
| Computer equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Useful life (in years) | 3 years | |
| Original cost | $ 1,677,000 | $ 693,000 |