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Capital Stock - Share Purchase Warrants (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]    
Number of Warrants, Beginning balance 2,659,417  
Number of Warrants, Issued 86,730,975  
Number of Warrants, Exercised (37,079,990)  
Number of Warrants, Extinguished or expired (203,905)  
Number of Warrants, Ending balance 52,106,497 2,659,417
Weighted Average Exercise Price, Beginning Balance $ 1.83  
Weighted Average Exercise Price, Issued 0.54  
Weighted Average Exercise Price, Exercised 0.25  
Weighted Average Exercise Price, Extinguished or expired 2.39  
Weighted Average Exercise Price, Ending Balance $ 0.74 $ 1.83
Weighted Average Remaining Life, Warrants Issued 4 years 3 months 18 days  
Weighted Average Remaining Life 4 years 2 months 27 days 4 years 1 month 24 days