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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets        
Net operating loss carryforwards $ 67,253 $ 45,531    
Accrued expenses 2,561 1,328    
Stock-based compensation 4,272 1,535    
Operating lease liabilities 642 1,107    
Other 1,865 738    
Gross deferred tax assets 76,593 50,239    
Deferred tax liabilities        
Fixed assets and intangible assets (112) (223)    
Operating lease right-of-use assets (485) (825)    
Other (848) 0    
Gross deferred tax liabilities (1,445) (1,048)    
Valuation allowance (74,244) (49,159) $ (40,913) $ (27,994)
Net deferred tax assets $ 904 $ 32