Net Income (Loss) Per Share - Calculations of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic:
Net income (loss)	$ (22,097)	$ (15,452)
Weighted average common shares outstanding (in shares)	20,380	20,448
Net income (loss) per share (in dollars per share)	$ (1.08)	$ (0.76)
Diluted:
Weighted average common shares outstanding (in shares)	20,380	20,448
Net income (loss) per share (in dollars per share)	$ (1.08)	$ (0.76)