Quarterly Financial Information - Summary of Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 26,797	$ 22,467	$ 22,738	$ 25,439	$ 25,028	$ 26,435	$ 28,873	$ 26,265	$ 97,441	$ 106,601
Gross profit	3,954	3,677	3,893	4,296	4,916	4,873	5,232	5,449	15,820	20,470
Income (loss) from operations	(1,307)	(415)	(85)	649	1,297	1,387	1,871	1,876	(1,158)	6,431
Net income (loss)	$ (1,261)	$ (106)	$ (185)	$ 500	$ 1,140	$ 1,245	$ 1,885	$ 1,823	$ (1,052)	$ 6,093
Basic income (loss) per share	$ (0.10)	$ (0.01)	$ (0.02)	$ 0.04	$ 0.09	$ 0.10	$ 0.16	$ 0.15	$ (0.09)	$ 0.51
Diluted income (loss) per share	$ (0.10)	$ (0.01)	$ (0.02)	$ 0.04	$ 0.09	$ 0.10	$ 0.15	$ 0.15	$ (0.09)	$ 0.49
Shares used in calculation of income (loss) per share:
Basic	12,473	12,310	12,152	12,102	12,047	11,959	11,856	11,778	12,260	11,938
Diluted	12,473	12,310	12,152	12,531	12,649	12,466	12,295	12,057	12,260	12,419