Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summarizes Fortress warrant activities (Detail)

v3.6.0.2
Stockholders' Equity - Summarizes Fortress warrant activities (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Granted 1,950,000  
Warrant [Member]    
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Outstanding 569,835  
Number of shares, Granted 1,880,000  
Number of shares, Expired (161,382)  
Number of shares, Exercised [1] (25,000)  
Number of shares, Outstanding 2,263,453 569,835
Number of shares, Exercisable 483,453  
Weighted average exercise price, Outstanding $ 6.31  
Weighted average exercise price, Granted 3.00  
Weighted average exercise price, Expired 6.30  
Weighted average exercise price, Exercised [1] 1.37  
Weighted average exercise price, Outstanding 3.62 $ 6.31
Weighted average exercise price, Exercisable $ 5.88  
Total weighted average instrinsic value, Outstanding $ 120,700  
Total weighted average intrinsic value, Granted 0  
Total weighted average intrinsic value, Exercised [1] 33,250  
Total weighted average intrinsic value, Cancelled 79,800  
Total weighted average intrinsic value, Exercisable $ 79,800  
Weighted average remaining contractual life (years), Outstanding 4 years 8 months 26 days 1 year 10 months 2 days
Weighted average remaining contractual life, Exercisable (years) 2 years 1 month 17 days  
[1] cashless