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Warrants - Summary of Warrant Activity (Detail) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Warrants and Rights Note Disclosure [Abstract]    
Warrants outstanding, beginning of period 2,350,085 612,112
Issuances 49,776
Warrants outstanding, end of period 2,350,085 661,888