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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)