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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Net operating loss carryforwards $ 19,197 $ 8,165  
Research and development tax credit carryforwards 6,470 5,040  
Accrued expenses and other current liabilities 566 671  
Intangible assets 1,598 33  
Property and equipment 220 215  
Stock-based compensation 3,092 1,463  
Operating lease liability 2,829    
Other 221 725  
Total deferred tax assets 34,193 16,312  
Valuation allowance (30,558) (15,292) $ (11,257)
Net deferred tax assets 3,635 1,020  
Deferred tax liabilities:      
Capitalized software development costs (1,088) (1,020)  
Operating lease right-of-use assets (2,547)    
Deferred tax liabilities (3,635) (1,020)  
Net deferred tax assets and liabilities $ 0 $ 0