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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes Disclosure [Line Items]        
Federal income tax rate 34.00% 34.00% 34.00%  
Increase in valuation allowance $ 6,200,000 $ 3,700,000    
Unrecognized tax benefit would impact the effective tax rate 2,600,000      
Unrecognized tax benefit 5,252,000 2,431,000 $ 2,054,000 $ 2,196,000
Accrued interest and penalties related to unrecognized tax benefits 300,000 $ 0 $ 0  
Domestic Federal [Member]        
Income Taxes Disclosure [Line Items]        
Net operating loss carryforwards $ 198,200,000      
Operating loss carryforwards, expiration year 2018      
Tax credit carryforwards $ 3,900,000      
Tax credit carryforwards, expiration year 2021      
Domestic State [Member]        
Income Taxes Disclosure [Line Items]        
Net operating loss carryforwards $ 102,100,000      
Operating loss carryforwards, expiration year 2017      
Domestic State [Member] | California [Member]        
Income Taxes Disclosure [Line Items]        
Tax credit carryforwards $ 4,800,000      
Foreign [Member]        
Income Taxes Disclosure [Line Items]        
Net operating loss carryforwards $ 2,400,000      
Statutes of limitation for income tax returns start year 4 years      
Statutes of limitation for income tax returns end year 6 years