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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 23,030 | $ 25,745
Tax credits | 52,902 | 43,838
Compensation | 18,791 | 15,934
Deferred revenue | 25,599 | 27,587
Research and development expense deferral | 0 | 12,631
Other | 4,065 | 5,393
Gross deferred income tax assets | 124,387 | 131,128
Less: valuation allowance | (7,653) | (20,415)
Net deferred income tax assets | 116,734 | 110,713
Deferred income tax liabilities: |  |
Depreciation and amortization | (52,978) | (60,872)
Deferred revenue | (44,198) | (54,508)
Total deferred income tax liabilities | (97,176) | (115,380)
Net deferred income taxes, deferred income tax asset | 19,558 |
Net deferred income taxes, deferred income tax liability |  | (4,667)
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset – noncurrent | 51,611 | 27,048
Deferred income tax liability – noncurrent | (32,053) | (31,715)
Net deferred income taxes, deferred income tax asset | $ 19,558 |
Net deferred income taxes, deferred income tax liability |  | $ (4,667)

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