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Income Taxes - Summary of Statutory Tax Rates and Effective Tax Rates (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory rate benefit (35.00%) (35.00%) (35.00%)
State and local income tax benefit (net of federal tax benefit) (1.00%) (1.00%) (2.00%)
Foreign Rate Differential 4.00% 6.00%  
Credits (7.00%) 3.00% (11.00%)
Stock Compensation 5.00% 9.00%  
NOL accrual to return   (3.00%)  
Other 1.00% 2.00% 7.00%
Fines and penalties 6.00%    
Valuation allowance 29.00% 21.00% 42.00%
Effective tax rate 2.00% 2.00% 1.00%