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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) (Level 3 [Member], USD $)
6 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2013
Warrant Group 1 [Member]
Jun. 30, 2013
Warrant Group 1 [Member]
Minimum [Member]
Jun. 30, 2013
Warrant Group 1 [Member]
Maximum [Member]
Jun. 30, 2013
Warrant Group 1 [Member]
Derivative Financial Instruments, Assets [Member]
Sep. 30, 2013
Warrant Group 2 [Member]
Minimum [Member]
Dec. 31, 2013
Warrant Group 2 [Member]
Minimum [Member]
Sep. 30, 2013
Warrant Group 2 [Member]
Maximum [Member]
Dec. 31, 2013
Warrant Group 2 [Member]
Maximum [Member]
Sep. 30, 2013
Warrant Group 2 [Member]
Derivative Financial Instruments, Assets [Member]
Dec. 31, 2013
Warrant Group 2 [Member]
Derivative Financial Instruments, Assets [Member]
Sep. 30, 2014
Warrant Group 3 [Member]
Sep. 30, 2013
Warrant Group 3 [Member]
Sep. 30, 2014
Warrant Group 3 [Member]
Minimum [Member]
Sep. 30, 2013
Warrant Group 3 [Member]
Minimum [Member]
Dec. 31, 2013
Warrant Group 3 [Member]
Minimum [Member]
Sep. 30, 2014
Warrant Group 3 [Member]
Maximum [Member]
Sep. 30, 2013
Warrant Group 3 [Member]
Maximum [Member]
Dec. 31, 2013
Warrant Group 3 [Member]
Maximum [Member]
Sep. 30, 2014
Warrant Group 3 [Member]
Derivative Financial Instruments, Assets [Member]
Sep. 30, 2013
Warrant Group 3 [Member]
Derivative Financial Instruments, Assets [Member]
Dec. 31, 2013
Warrant Group 3 [Member]
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]                                          
Linked common shares       1,725,000         525,000 525,000                 1,562,500 1,562,500 1,562,500
Quoted market price on valuation date       $ 3.00         $ 3.00 $ 2.02                 $ 0.91 $ 3.00 $ 2.02
Contractual exercise rate       $ 2.4648         $ 2.4648 $ 2.3793                 $ 3.60 $ 3.60 $ 3.60
Term (years)       11 days         6 months 15 days 3 months 11 days                 2 years 7 months 10 days 3 years 7 months 10 days 3 years 4 months 6 days
Range of market volatilities   24.00% 31.50%   26.30% 50.10% 46.10% 88.30%         57.00% 38.20% 51.10% 79.70% 60.50% 78.20%      
Risk free rates using zero coupon US Treasury Security rates 0.03%       0.02% 0.01% 0.04% 0.07%         0.02% 0.02% 0.07% 0.58% 0.63% 0.78%      
Custom lattice variable: Probability of exercisability (434,027 linked common shares)                     0.00% 0.00%