Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summarizes Fortress warrant activities (Detail)

v3.7.0.1
Stockholders' Equity - Summarizes Fortress warrant activities (Detail) - Warrant [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Outstanding 2,263,453  
Number of shares, Granted 167,946  
Number of shares, Outstanding 2,431,399 2,263,453
Number of shares, Exercisable 471,399  
Weighted average exercise price, Outstanding $ 3.62  
Weighted average exercise price, Granted 3.37  
Weighted average exercise price, Outstanding 3.6 $ 3.62
Weighted average exercise price, Exercisable $ 6.08  
Total weighted average instrinsic value, Outstanding $ 79,800  
Total weighted average intrinsic value, Granted 0  
Total weighted average intrinsic value, Cancelled 209,800  
Total weighted average intrinsic value, Exercisable $ 139,800  
Weighted average remaining contractual life (years), Outstanding 2 years 4 months 13 days 4 years 8 months 26 days
Weighted average remaining contractual life, Granted (years) 4 years 11 months 16 days  
Weighted average remaining contractual life, Exercisable (years) 1 year 11 months 23 days