Organization and Business - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Organization and Nature of Operations [Line Items]
Cash			$ 7,111	$ 9,375	$ 6,473	$ 8,854
Stock issued during period, shares, new issues	5,882,352
Proceeds from issuance initial public offering	$ 9,300
Warrant
Organization and Nature of Operations [Line Items]
Stock issued during period, shares, new issues	2,941,176
Stock issued during period, value, new issues	$ 10,000	$ 25,000
2016 Registered Direct Offering
Organization and Nature of Operations [Line Items]
Debt Issuance Costs, Net	$ 300