Warrants - Summary of Warrant Activity (Detail) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Class of Warrant or Right [Line Items]
Warrants, Beginning balance	175,584	175,584
Warrants, Granted	4,621,037
Warrants, Exercised	0	0
Warrants, Expired	0	0
Warrants, Ending balance	4,796,621	175,584
Weighted Average [Member]
Class of Warrant or Right [Line Items]
Weighted Average Price, Beginning balance	$ 1.50	$ 1.50
Weighted Average Price, Granted	0.31
Weighted Average Price, Exercised	0	0
Weighted Average Price, Expired	0	0
Weighted Average Price, Ending balance	$ 0.35	$ 1.50