Warrants - Summary of Warrant Activity (Detail) - shares	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Warrants and Rights Note Disclosure [Abstract]
Warrants outstanding, beginning of period		4,658.000	477,613.000	616,770	208.614
Issuances	2,345,427	2,345,427	134,499	2,395,203	403,498
Exercises and conversions				(661,888)
Warrants outstanding, end of period		2,350,085	612,112	2,350,085	612,112