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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Dec. 01, 2014
Oct. 01, 2014
Aug. 14, 2014
Dec. 31, 2013
Derivative [Line Items]              
Linked common shares 130,208 130,208          
Quoted market price on valuation date   $ 2.50 $ 1.25 $ 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 $ 3.59 $ 3.24          
Contractual exercise price $ 43.20 $ 43.20          
Term (years) 7 months 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 29.90% 92.90%          
Risk free rates using zero coupon US Treasury Security rates 0.20% 0.16%          
Level 3 [Member] | Maximum [Member] | Derivative Financial Instruments, Assets [Member]              
Derivative [Line Items]              
Range of market volatilities 158.80% 113.20%          
Risk free rates using zero coupon US Treasury Security rates 0.45% 0.65%