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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 82,403 $ 46,112
Tax credits 25,800 17,423
Deferred revenue 9,035 14,194
Operating lease liability 7,365 9,196
Stock based compensation 4,751 1,892
Reserve and accruals 2,844 2,635
Total gross deferred tax assets 132,198 91,452
Valuation allowance (124,233) (81,980)
Total deferred tax assets 7,965 9,472
Operating lease right-of-use asset (6,925) (8,805)
Fixed and intangible assets (1,040) (667)
Total deferred tax liabilities $ (7,965) $ (9,472)