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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
U.S. federal tax statutory rate 35.00% 35.00% 35.00%
Net operating loss $ 244,400,000    
Current income tax (9,000) $ 134,000 $ 475,000
Deferred tax asset related to net operating loss carryforwards 121,248,000 35,650,000  
Unrealized excess tax benefits from stock-based compensation 3,600,000    
Unrecognized tax benefits 0    
Deferred tax liability, current 0 $ 97,499,000  
Federal      
Income Tax Contingency [Line Items]      
Net operating loss 333,900,000    
Stock-based compensation related to unrealized excess tax benefits 9,600,000    
State      
Income Tax Contingency [Line Items]      
Net operating loss 266,500,000    
Stock-based compensation related to unrealized excess tax benefits $ 7,600,000