Business Segment, Geographic and Quarterly Financial Data - Summary of Quarterly Financial Data (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
Segment Reporting [Abstract]
Revenues	$ 18,201	$ 21,677	$ 18,683	$ 15,103	$ 18,684	$ 21,482	$ 20,190	$ 18,661
Cost of sales	11,294	13,829	11,547	8,437	9,820	11,582	11,677	10,810
Net (loss) income	$ (9,066)	$ (289)	$ (1,371)	$ (1,654)	$ (17,111)	$ 1,192	$ (720)	$ (1,086)	$ (12,380)	$ (17,725)	$ 5,101
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.39)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.75)	$ 0.05	$ (0.03)	$ (0.05)	$ (0.54)	$ (0.78)	$ 0.23
Diluted (in dollars per share)	$ (0.39)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.75)	$ 0.05	$ (0.03)	$ (0.05)	$ (0.54)	$ (0.78)	$ 0.23