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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income taxes at statutory rate $ (42,570) $ (29,990) $ (17,839)
State income taxes, net of federal benefit (5,417) (1,096) 180
Permanent differences 1,264 772 229
Change in valuation allowance 46,901 30,051 17,756
Other (94) 431 (97)
Provision for income taxes $ 84 $ 168 $ 229