Income Taxes - Summary of provision for income taxes was different from the amount computed using the federal statutory rate (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Effective Income Tax Rate Reconciliation, Amount [Abstract] | ||
| Income tax provision at federal statutory rate (21%) | $ (28,642) | $ (76,385) |
| Interest on convertible securities | 6,537 | 3,505 |
| Interest on convertible securities discount | 4,423 | 3,257 |
| Debt issuance cost related to convertible securities | 0 | 76 |
| Derivative liability related to convertible securities | (19,688) | 29,098 |
| Warrant expense | 16,823 | 596 |
| Meals and entertainment | 13 | 210 |
| Health insurance industry fee | 2,715 | 0 |
| Other, net | (766) | 0 |
| Valuation allowance | 18,585 | 39,643 |
| Provision for income taxes | $ 0 | $ 0 |