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Income Taxes - Reconciliation of (Benefit) Provision for Income Taxes at Statutory Federal Tax Rate to Company's Actual Income Tax (Benefit) Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Computed at federal statutory rate $ (58,574) $ (94,354)
State taxes, net of federal benefit (10,898) (20,500)
Non-deductible expenses 18 137
Stock-based compensation 643 602
Return to provision adjustments (945) (6,096)
Refund of AMT Sequestration (646) 0
Change in valuation allowance 69,285 120,211
Other 471 0
Total (benefit) provision $ (646) $ 0