Net Loss Per Share - Basic and Diluted Earnings Per share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net loss	$ (10,127)	$ (4,422)	$ 7,136	$ (32,968)	$ 420	$ (14,373)	$ (8,069)	$ (3,358)	$ (40,381)	$ (25,380)	$ (20,939)
Net loss per common share, basic and diluted:
Weighted average common shares outstanding, basic									60,687,478	60,687,478	60,687,478
Net loss per share, basic and diluted									$ (0.67)	$ (0.42)	$ (0.35)