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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income Tax [Line Items]          
Total deferred tax valuation allowance         $ 150,400
Provision for (benefit from) income taxes $ 35 $ 1,116 $ (923) $ 3,190  
Change in federal and state valuation allowances     39.90%    
Effective tax rate 0.30% 3.50% (2.00%) 4.90%  
Decrease in unrecognized tax positions $ 1,800   $ 1,800    
Possible interest and accrued penalties 2,600   $ 2,600    
Maximum [Member]          
Income Tax [Line Items]          
Provision for (benefit from) income taxes $ 100