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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets    
Net operating loss carryforwards $ 46,629 $ 56,182
Research credits 48,128 38,047
Unrealized loss on securities 327 195
Capitalized lease assets 489 288
Accrued compensation 9,207 8,464
Deferred revenue   11,925
Gross deferred income tax assets 104,780 115,101
Valuation allowance (93,580) (105,995)
Net deferred income tax assets 11,200 9,106
Deferred income tax liabilities    
Patent costs (3,416) (4,219)
Equity investment (3,508) (4,497)
Licensing costs (151) (194)
Capitalized legal costs (13) (21)
Depreciation (288) (151)
Unrealized gain on securities (3,824) (24)
Gross deferred income tax liabilities $ (11,200) $ (9,106)