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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:        
Reserves and accruals $ 17,247 $ 25,527    
Net operating loss carryforwards 34,915 33,321    
Research and development credit carryforwards 34,419 28,759    
Deferred stock-based compensation 2,677 4,292    
Depreciation and amortization 0 554    
Intangibles 2,062      
Other tax credits 0 2,738    
Other 1,441      
Gross deferred tax assets 92,761 95,191    
Valuation allowance (77,756) (74,480) $ (64,545) $ (75,199)
Gross deferred tax assets after valuation allowance 15,005 20,711    
Deferred tax liabilities:        
Depreciation and amortization (259) 0    
Intangibles 0 (1,417)    
Convertible notes (4,284) (8,603)    
Other 0 (510)    
Gross deferred tax liabilities (4,543) (10,530)    
Net deferred tax assets $ 10,462 $ 10,181