Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - summarizes Fortress warrant activities (Detail)

v3.4.0.3
Stockholders' Equity - summarizes Fortress warrant activities (Detail) - Warrant [Member] - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Outstanding 569,835  
Number of shares, Exercised [1] (25,000)  
Number of shares, Outstanding 544,835 569,835
Number of shares, Exercisable 544,835  
Weighted average exercise price, Outstanding $ 6.31  
Weighted average exercise price, Exercised [1] 1.37  
Weighted average exercise price, Outstanding 6.53 $ 6.31
Weighted average exercise price, Exercisable $ 6.53  
Total weighted average instrinsic value, Outstanding $ 120,700  
Total weighted average intrinsic value, Exercised [1] 43,250  
Total weighted average instrinsic value, Outstanding 103,800 $ 120,700
Total weighted average intrinsic value, Exercisable $ 103,800  
Weighted average remaining contractual life (years), Outstanding 1 year 8 months 1 day 1 year 10 months 2 days
Weighted average remaining contractual life, Exercisable (years) 1 year 8 months 1 day  
[1] cashless