Quarterly Financial Information - Schedule of Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Net revenue	$ 145,270	$ 140,456	$ 126,348	$ 105,946	$ 119,330	$ 115,951	$ 104,686	$ 91,962	$ 518,020	$ 431,929	$ 301,253
Gross profit	39,210	39,628	34,809	26,405	31,210	29,949	26,255	22,274	140,052	109,688	74,043
(Loss) income from continuing operations	5,056	6,196	2,327	401	2,377	3,068	1,436	(243)	13,980	6,638	(4,294)
Net (loss) income	5,056	6,196	2,307	373	2,377	2,967	1,226	(530)	13,932	6,040	(1,906)
Net (loss) income attributable to common stockholders	$ 5,056	$ 6,196	$ 2,307	$ (19,524)	$ 751	$ 1,389	$ (306)	$ (2,017)	$ (5,965)	$ (183)	$ (7,435)
Net (loss) income per share (basic and diluted):
(Loss) income per share from continuing operations attributable to common stockholders	$ 0.16	$ 0.19	$ 0.08	$ (0.75)	$ 0.03	$ 0.07		$ (0.08)	$ (0.20)	$ 0.02	$ (0.49)
(Loss) income per share attributable to common stockholders	$ 0.16	$ 0.19	$ 0.07	$ (0.76)	$ 0.03	$ 0.07	$ (0.01)	$ (0.09)	$ (0.20)	$ (0.01)	$ (0.37)