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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 164,276 | $ 133,765
Research and development tax credit carryforwards | 27,679 | 21,459
Stock-based compensation | 5,321 | 4,194
Deferred revenue | 20,681 | 32,171
Fixed assets | 10,525 | 11,282
Lease liability | 10,251 | 11,722
Accruals and reserves | 430 | 675
Other | 308 | 151
Total deferred tax asset | 239,471 | 215,419
Valuation allowance | 214,351 | 187,724
Deferred tax assets | 25,120 | 27,695
Liabilities: |  |
Intangible assets | (14,321) | (13,609)
Operating lease right-of-use assets | (17,510) | (20,656)
Deferred tax liabilities | (31,831) | (34,265)
Total net deferred tax liabilities | $ (6,711) | $ (6,570)

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