Derivative Liability - Schedule of Activities of Warrants (Detail) - Placement Agent Warrants - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Number of shares
Outstanding and exercisable, beginning balance, shares	10,390
Warrants exercised, shares	0
Outstanding and exercisable, ending balance, shares	10,390	10,390
Weighted average exercise price
Outstanding and exercisable, beginning balance (usd per share)	$ 40.00
Warrants exercised (usd per share)	0.00
Outstanding and exercisable, ending balance (usd per share)	$ 16.22	$ 40.00
Weighted average remaining life
Outstanding and exercisable	3 years 3 months 18 days	4 years 3 months 18 days

Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Exercised

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Class Of Warrant Or Right Exercises In Period

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Class of Warrant or Right, Outstanding And Exercisable

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Class of Warrant or Right, Outstanding And Exercisable, Weighted Average Exercise Price

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Class of Warrant or Right, Outstanding and Exercisable, Weighted Average Remaining Contractual Term

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Class of Warrant or Right, Warrants Roll Forward [Roll Forward]

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Class of Warrant or Right, Warrants Weighted Average Exercise Price [Roll Forward]

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Class of Warrant or Right, Warrants, Weighted Average Remaining Contractual Term [Abstract]

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