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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax [Line Items]        
Deferred tax asset, valuation allowance $ (63,612) $ (58,781)    
Number of years cumulative pre-tax loss 3 years      
Unrecognized tax benefits $ 10,359 $ 8,861 $ 7,835 $ 5,897
Uncertain tax benefits that, if realized, would affect the effective tax rate 8,900      
Accrued interest and penalties 1,200      
Increase in accrued interest and penalties 100      
Operating loss carryforwards state 91,100      
Operating loss carryforwards federal $ 90,400      
Federal and state net operating loss carryforwards, expiring year 2035      
Federal research and development tax credits $ 3,300      
State research and development tax credits 3,000      
Operating loss carryforwards foreign $ 37,600      
Foreign net operating loss carryforward expiration year 2018      
Federal research and development tax credits [Member]        
Income Tax [Line Items]        
Federal research and development tax credits expiration year 2035