Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - summarizes Fortress warrant activities (Detail)

v3.3.1.900
Stockholders' Equity - summarizes Fortress warrant activities (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Granted 1,950,000  
Forfeited (1,250,000)  
Warrant [Member]    
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Outstanding 685,061  
Number of shares, Granted 0  
Number of shares, Exercised 0  
Forfeited (115,226)  
Number of shares, Outstanding 569,835 685,061
Number of shares, Exercisable 569,835  
Weighted average exercise price, Outstanding $ 6.65  
Weighted average exercise price, Granted 0  
Weighted average exercise price, Exercised 0  
Weighted average exercise price, Cancelled 8.33  
Weighted average exercise price, Outstanding 6.31 $ 6.65
Weighted average exercise price, Exercisable $ 6.31  
Total weighted average instrinsic value, Outstanding $ 90,950,000  
Total weighted average intrinsic value, Granted 0  
Total weighted average intrinsic value, Exercised 0  
Total weighted average intrinsic value, Cancelled 0  
Total weighted average instrinsic value, Outstanding 120,700,000 $ 90,950,000
Total weighted average intrinsic value, Exercisable $ 120,700,000  
Weighted average remaining contractual life (years), Outstanding 1 year 10 months 2 days 1 year 6 months 11 days
Weighted average remaining contractual life, Exercisable (years) 1 year 10 months 2 days