Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - summarizes Fortress warrant activities (Detail)

v3.5.0.2
Stockholders' Equity - summarizes Fortress warrant activities (Detail) - Warrant [Member] - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items]    
Number of shares, Outstanding 569,835  
Number of shares, Granted 100,000  
Number of shares, Expired (129,767)  
Number of shares, Exercised [1] (25,000)  
Number of shares, Outstanding 515,068 569,835
Number of shares, Exercisable 415,068  
Weighted average exercise price, Outstanding $ 6.31  
Weighted average exercise price, Granted 3.00  
Weighted average exercise price, Expired 5.59  
Weighted average exercise price, Exercised [1] 1.37  
Weighted average exercise price, Outstanding 6.09 $ 6.31
Weighted average exercise price, Exercisable $ 6.83  
Total weighted average instrinsic value, Outstanding $ 120,700  
Total weighted average intrinsic value, Granted 0  
Total weighted average intrinsic value, Expired 0  
Total weighted average intrinsic value, Exercised [1] 33,000  
Total weighted average instrinsic value, Outstanding 79,200 $ 120,700
Total weighted average intrinsic value, Exercisable $ 79,200  
Weighted average remaining contractual life (years), Outstanding 2 years 5 months 23 days 1 year 10 months 2 days
Weighted average remaining contractual life (years), Granted 4 years 11 months 1 day  
Weighted average remaining contractual life, Exercisable (years) 1 year 10 months 20 days  
[1] - cashless