Selected Quarterly Financial Data (unaudited) - Summary of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 27,280	$ 25,126	$ 24,370	$ 23,026	$ 25,000	$ 23,217	$ 20,670	$ 18,182	$ 99,802	$ 87,069	$ 66,467
Gross profit	12,228	11,171	10,813	9,544	11,472	10,294	10,239	8,709	43,756	40,714	31,737
Net (loss)	(1,473)	(125)	(176)	(761)	$ 1,047	$ (291)	$ 274	$ 102	(2,535)	1,132	2,033
Deemed dividends on preferred stock and amortization of preferred stock beneficial conversion feature	122								122
Net (loss) available to common stockholders	$ (1,595)	$ (125)	$ (176)	$ (761)					$ (2,657)	$ 1,132	$ 2,033
Net (loss) per common share:
Basic	$ (0.03)	$ 0.00	$ 0.00	$ (0.01)	$ 0.02	$ (0.01)	$ 0.01	$ 0.00	$ (0.04)	$ 0.02	$ 0.04
Diluted	$ (0.03)	$ 0.00	$ 0.00	$ (0.01)	$ 0.02	$ (0.01)	$ 0.01	$ 0.00	$ (0.04)	$ 0.02	$ 0.04
Basic weighted average common shares outstanding	60,859	60,537	60,425	60,277	60,043	54,444	49,890	49,277	60,526	53,483	48,263
Weighted average shares outstanding – Diluted	60,859	60,537	60,425	60,277	62,732	54,444	53,733	53,469	60,526	56,016	52,775