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Income Taxes - Deferred Tax Assets and Liabilities Result from Differences in Timing of Recognition of Certain Income and Expense Items for Tax and Financial Accounting Purposes (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 25,745 | $ 38,419
Tax credits | 43,838 | 37,305
Compensation | 15,934 | 18,124
Deferred revenue | 27,587 | 22,248
Research and development expense deferral | 12,631 |
Other | 5,393 | 9,055
Gross deferred income tax assets | 131,128 | 125,151
Less: valuation allowance | (20,415) | (7,808)
Net deferred income tax assets | 110,713 | 117,343
Deferred income tax liabilities: |  |
Depreciation and amortization | (60,872) | (67,504)
Deferred revenue | (54,508) |
Total deferred income tax liabilities | (115,380) | (67,504)
Net deferred income taxes |  | 49,839
Net deferred income taxes | (4,667) |
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset - noncurrent | 27,048 | 66,749
Deferred income tax liability - noncurrent | (31,715) | (16,910)
Net deferred income taxes |  | $ 49,839
Net deferred income taxes | $ (4,667) |

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