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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 138,896 $ 91,308
Research and development tax credit carryforwards 16,829 15,147
Stock-based compensation 3,801 3,168
Deferred revenue 3,191 934
Build to suit lease liability 6,400 5,232
Other 604 366
Total deferred tax asset 169,721 116,155
Valuation allowance 158,150 112,833
Net deferred tax assets 11,571 3,322
Liabilities:    
Intangible assets (14,100)  
Fixed Assets (4,176) (3,322)
Net deferred tax liability (18,276) $ (3,322)
Total deferred tax liability $ (6,705)