Quarterly Financial Information - Summary of Condensed Consolidated Statements of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$ 25,829	$ 23,572	$ 21,837	$ 20,870	$ 25,856	$ 25,485	$ 24,505	$ 25,548	$ 92,108	$ 101,394
Gross profit	4,516	3,369	3,793	3,347	5,025	4,842	4,390	4,802	15,025	19,059
Income (loss) from operations	25	(1,395)	(786)	(947)	611	1,115	(270)	(277)	(3,103)	1,179
Net income (loss)	$ (23)	$ (3,567)	$ (805)	$ (862)	$ 696	$ 610	$ (202)	$ (188)	$ (5,257)	$ 916
Basic income (loss) per share	$ 0.00	$ (0.32)	$ (0.07)	$ (0.08)	$ 0.06	$ 0.06	$ (0.02)	$ (0.02)	$ (0.47)	$ 0.08
Diluted income (loss) per share	$ 0.00	$ (0.32)	$ (0.07)	$ (0.08)	$ 0.06	$ 0.05	$ (0.02)	$ (0.02)	$ (0.47)	$ 0.08
Shares used in calculation of income (loss) per share:
Basic	11,246	11,194	11,149	11,107	11,058	10,943	10,922	10,875	11,174	10,945
Diluted	11,246	11,194	11,149	11,107	11,310	11,474	10,922	10,875	11,174	11,449