Selected Quarterly Financial Data (unaudited) - 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
Income Statement [Abstract]
Total revenues	$ 52,412	$ 46,812	$ 35,204	$ 61,701	$ 63,953	$ 41,193	$ 31,883	$ 47,129	$ 196,129	$ 184,158	$ 177,325
Cost of sales (excludes amortization of intangible assets)	18,122	16,961	15,493	21,112	21,263	16,768	15,902	20,247	71,688	74,180	66,976
Gross profit	32,700	28,261	18,121	39,018	41,120	22,854	14,410	25,311
Total costs and expenses (1)	49,750	45,600	45,029	53,012	51,038	51,314	41,868	49,146	193,391	193,366	172,483
Net income (loss)	$ (377)	$ (762)	$ (8,931)	$ 3,991	$ 7,113	$ (5,767)	$ (6,908)	$ (1,512)	$ (6,079)	$ (7,074)	$ 7,390
Basic (loss) earnings per share	$ (0.01)	$ (0.02)	$ (0.26)	$ 0.12	$ 0.21	$ (0.17)	$ (0.20)	$ (0.04)	$ (0.18)	$ (0.21)	$ 0.22
Diluted net earnings (loss) per share	$ (0.01)	$ (0.02)	$ (0.26)	$ 0.11	$ 0.20	$ (0.17)	$ (0.20)	$ (0.04)	$ (0.18)	$ (0.21)	$ 0.21