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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 38,739 $ 15,650
Accrued liabilities and reserves 1,623 716
Stock-based compensation 1,434 253
Intangible assets 9,792 10,435
Operating lease liability 3,427 4,121
Research and development credits 10,471 4,991
Total deferred tax assets 65,486 36,166
Deferred tax liabilities:    
Property and equipment (269) (167)
Right-of-use assets (3,243) (3,956)
Total deferred tax liabilities (3,512) (4,123)
Valuation allowance $ (61,974) $ (32,043)