Summary of Outstanding Warrants Issued by Company (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	671,878
Consultant Warrant
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	85,000
Weighted Average Exercise Price	$ 10.70
Issue Date	Aug. 13, 2014
Expiration Date	Aug. 13, 2019
Opus Warrant
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	200,000
Weighted Average Exercise Price	$ 2.19
Issue Date	Mar. 31, 2014
Expiration Date	Mar. 31, 2019
New Opus Warrant 1
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	100,000
Weighted Average Exercise Price	$ 2.22	$ 2.22
Issue Date	Sep. 30, 2016
Expiration Date	Sep. 30, 2021
2013 Private Placement Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	186,878
Weighted Average Exercise Price	$ 10.00
Issue Date	Aug. 14, 2013
Expiration Date	Aug. 14, 2017
New Opus Warrant 2
Class Of Warrant Or Right [Line Items]
Number of Shares Issuable Upon Exercise	100,000
Weighted Average Exercise Price	$ 3.61
Issue Date	Dec. 31, 2016
Expiration Date	Dec. 31, 2021