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Income Taxes - Schedule of Significant Components of Company's Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 84,531 $ 31,496
Accruals and reserves 4,785 2,868
Operating lease liabilities 16,782 14,214
Other deferred tax assets 1,517 28
Stock-based compensation 9,605 5,217
Deferred revenue 86  
Deferred revenue   (20)
Research credit 19,526 7,150
Total deferred tax assets 136,832 60,953
Less valuation allowance (116,640) (45,913)
Net deferred tax assets 20,192 15,040
Deferred tax liabilities:    
Depreciation (6,778) (3,901)
Operating lease assets (13,776) (11,068)
Intangible assets (31) (40)
Other deferred tax liabilities (4) (20)
Total deferred tax liabilities (20,589) (15,029)
Long term deferred taxes, assets   $ 11
Long term deferred taxes, liabilities $ (397)