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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Gross [Abstract]    
Net operating loss carryforwards $ 29,291 $ 24,104
Capitalized start‑up costs 11 13
Stock-based compensation 3,241 1,444
Research and development credits 1,039 1,039
Accruals and reserves 4,116 1,416
Operating lease liabilities 2,475  
Property and equipment 154 103
Intangibles 195 624
Indirect tax 313  
Total deferred tax assets 40,835 28,743
Valuation allowance (225) (28,743)
Deferred tax assets after valuation allowance 40,610  
Deferred Tax Liabilities, Gross [Abstract]    
Goodwill (392)  
Operating lease right-of-use assets (2,247)  
Total deferred tax liabilities (2,639)  
Net deferred tax assets $ 37,971 $ 0