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Income Taxes - Components of Deferred Tax Assets And Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 70,751 $ 50,511
Tax credit carryforwards 19,353 13,767
Accrued expenses 11,372 2,219
Capitalized patent costs 46,197 39,070
Lease Liabilities 7,083 7,879
Deferred revenue 25,724 31,880
Other 5,204 7,865
Total deferred tax assets 185,684 153,191
Less valuation allowance (178,307) (144,540)
Net deferred tax assets 7,377 8,651
Deferred tax liabilities (7,377) (8,651)
Deferred tax liabilities - depreciation and amortization (567) (859)
Deferred tax liabilities - Right-of-use assets $ (6,810) $ (7,792)