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Summary of Warrant Activity (Detail) - Warrant - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares    
Beginning Balance 8,908,586 5,470,995
Issued 4,579,710 3,571,425
Cancelled   (133,834)
Exercised 0 0
Ending Balance 13,488,296 8,908,586