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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)

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