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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Change in valuation allowance $ 12,300,000 $ 22,000,000 $ 21,600,000
Federal and state net operating loss carryforwards 42,900,000 53,393,000  
Foreign net operating loss carryforwards 11,704,000 8,421,000  
Benefit of stock options $ 19,500,000    
Percentage of ownership changes 0.00%    
Unrecognized tax benefits $ 19,700,000    
Accrued interest, unrecognized tax benefits $ 0 $ 0  
Unrecognized tax benefits description The Company does not anticipate a material change to its unrecognized tax benefits over the next twelve months that would affect the Company’s effective tax rate.    
Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Foreign statute of limitation generally remains open in the year 2007    
Latest Tax Year [Member]      
Income Taxes [Line Items]      
Foreign statute of limitation generally remains open in the year 2016    
Foreign net operating loss [Member]      
Income Taxes [Line Items]      
Foreign net operating loss carryforwards $ 48,300,000    
Foreign net operating loss [Member] | Minimum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards expiration year 2017    
Foreign net operating loss [Member] | Maximum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards expiration year 2026    
Federal [Member]      
Income Taxes [Line Items]      
Federal and state net operating loss carryforwards $ 170,100,000    
Operating loss carryforwards expiration year 2026    
Other tax credit carryforwards $ 31,500,000    
Other tax credit carryforwards expiration year 2018    
State [Member]      
Income Taxes [Line Items]      
Federal and state net operating loss carryforwards $ 138,200,000    
Operating loss carryforwards expiration year 2018    
State [Member] | California [Member]      
Income Taxes [Line Items]      
Other tax credit carryforwards $ 20,800,000