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Income Taxes - Components of Deferred Tax Assets and Liabilities for Federal and State Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 47,864 $ 21,309
Stock-based compensation 2,492 1,646
Reserves and accruals 1,239 513
Other 291 2
Total deferred tax assets 51,886 23,470
Less: valuation allowance (51,859) (23,455)
Deferred tax assets, net of valuation allowance 27 15
Deferred tax liabilities:    
Fixed assets 27 15
Total deferred tax liabilities (27) $ (15)
Net deferred tax assets 0  
Change in total valuation allowance $ 28,400