Loss per Share - Schedule of Calculation of Basic and Diluted Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic and diluted net loss per share
Net loss	$ (4,900)	$ (3,053)	$ (14,812)	$ (12,718)
Net loss allocated to common shareholders	$ (4,900)	$ (3,053)	$ (14,812)	$ (12,718)
Weighted average shares outstanding - basic and diluted	13,335	9,167	12,815	9,167
Basic and diluted net loss per share	$ (0.37)	$ (0.33)	$ (1.16)	$ (1.39)