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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 133,765 | $ 138,896
Research and development tax credit carryforwards | 21,459 | 16,829
Stock-based compensation | 4,194 | 3,801
Deferred revenue | 32,171 | 3,191
Fixed assets | 11,282 | 0
Deferred Tax Assets, Lease Liability | 11,722 | 0
Build to suit lease liability | 0 | 6,400
Accruals and reserves | 675 | 0
Other | 151 | 604
Total deferred tax asset | 215,419 | 169,721
Valuation allowance | 187,724 | 158,150
Net deferred tax assets | 27,695 | 11,571
Liabilities: |  |
Intangible assets | (13,609) | (14,100)
Operating lease right-of-use assets | 20,656 |
Fixed assets | 0 | (4,176)
Net deferred tax liability | (34,265) | (18,276)
Total deferred tax liability | $ (6,570) | $ (6,705)

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