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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)