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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 01, 2014
Oct. 01, 2014
Aug. 14, 2014
Dec. 31, 2013
Derivative [Line Items]            
Quoted market price on valuation date $ 1.25 $ 2.50 $ 2.50 $ 2.50 $ 2.50 $ 2.50
Level 3 [Member] | Derivative Financial Instruments, Assets [Member]            
Derivative [Line Items]            
Linked common shares 130,208 130,208        
Quoted market price on valuation date $ 6.79 $ 3.24        
Contractual exercise price $ 43.20 $ 43.20        
Term (years) 1 year 1 month 6 days 1 year 4 months 6 days        
Level 3 [Member] | Minimum [Member] | Derivative Financial Instruments, Assets [Member]            
Derivative [Line Items]            
Range of market volatilities 106.70% 92.90%        
Risk free rates using zero coupon US Treasury Security rates 0.21% 0.16%        
Level 3 [Member] | Maximum [Member] | Derivative Financial Instruments, Assets [Member]            
Derivative [Line Items]            
Range of market volatilities 139.40% 113.20%        
Risk free rates using zero coupon US Treasury Security rates 0.59% 0.65%