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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 20,347 | $ 23,030
Tax credits | 40,188 | 47,411
Compensation | 18,731 | 18,791
Deferred revenue | 19,169 | 25,599
Operating lease | 10,162 | 12,956
Other | 9,051 | 8,517
Gross deferred income tax assets | 117,648 | 136,304
Less: valuation allowance | (10,112) | (7,653)
Net deferred income tax assets | 107,536 | 128,651
Deferred income tax liabilities: |  |
Depreciation and amortization | (48,967) | (52,978)
Operating lease right-of-use asset | (7,650) | (11,917)
Deferred revenue | (33,947) | (44,198)
Total deferred income tax liabilities | (90,564) | (109,093)
Net deferred income taxes | 16,972 | 19,558
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset – noncurrent | 57,476 | 51,611
Deferred income tax liability – noncurrent | (40,504) | (32,053)
Net deferred income taxes | $ 16,972 | $ 19,558

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