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Income Taxes - Components of deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating losses $ 106,055 $ 64,259
Tax credit carryforwards 12,424 5,670
Accrued expenses 6,892 4,058
Lease liabilities 3,698 3,166
Licensed technology 2,775 1,534
Deferred revenue 1,076 1,088
Depreciation 493 502
Other 71 84
Total gross deferred tax assets 133,484 80,361
Valuation allowance (130,051) (77,375)
Net deferred tax assets less valuation allowance 3,433 2,986
Deferred tax liabilities    
Right-of-use assets (3,433) (2,986)
Total gross deferred tax liabilities (3,433) (2,986)
Net deferred taxes $ 0 $ 0