Basis of Presentation and Nature of Business - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	May. 22, 2014	Aug. 31, 2015	Jul. 31, 2015	May. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Description Of Business [Line Items]
Common stock, shares issued					30,441,410	29,794,960
Issuance of common stock, net of transaction expenses, shares		210,000	210,000	30,600
Completed a private placement	$ 10.0
IPO [Member]
Schedule Of Description Of Business [Line Items]
Common stock, shares issued	6,900,000
Common stock, price per share	$ 11.00
Issuance of common stock, net of transaction expenses, shares	900,000
Initial Public Offering And Private Placement [Member]
Schedule Of Description Of Business [Line Items]
Net proceeds from the IPO and the Private Placement	$ 78.6