Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ / shares in Units, $ in Thousands	Nov. 25, 2015 USD ($) $ / shares shares	Oct. 27, 2015 USD ($) $ / shares shares	Oct. 09, 2015
Subsequent Event [Line Items]
Reverse stock split conversion description			The Company effected a one-for-2.923 reverse stock split of its issued and outstanding shares of common stock and a proportional adjustment to the existing conversion ratios for each series of the Company's Convertible Preferred Stock.
Reverse stock split conversion ratio			0.34211
Common Stock [Member] | IPO [Member]
Subsequent Event [Line Items]
Number of shares issued		5,500,000
Shares issued, price per share | $ / shares		$ 13.00
Proceeds from issuance of initial public offering | $		$ 63,445
Number of common shares issued on conversion of convertible preferred stock		15,286,968
Common Stock [Member] | Overallotment Option Granted to Underwriters [Member]
Subsequent Event [Line Items]
Number of shares issued	104,775
Shares issued, price per share | $ / shares	$ 13.00
Proceeds from issuance of initial public offering | $	$ 1,250