Quarterly Financial Data - Condensed Consolidated Statement of Operations (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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 104,622	$ 101,151	$ 100,954	$ 89,762	$ 100,284	$ 100,994	$ 100,985	$ 100,014	$ 396,489	$ 402,277	$ 397,611
Cost of sales	21,411	23,865	21,910	19,339	21,457	25,268	25,414	26,773	86,525	98,912	106,912
Gross profit	83,211	77,286	79,044	70,423	78,827	75,726	75,571	73,241	309,964	303,365	290,699
Operating expense	75,831	73,147	74,116	77,615	74,874	69,218	68,867	73,270	300,709	286,229	301,891
Operating income (loss)	7,380	4,139	4,928	(7,192)	3,953	6,508	6,704	(29)	9,255	17,136	(11,192)
Net (loss) income from continuing operations	2,106	(788)	4,077	(7,737)	(5,090)	28	3,266	(1,948)	(2,342)	(3,744)	(18,205)
Net (loss) income	$ 3,369	$ (1,371)	$ 3,572	$ (8,379)	$ (5,798)	$ 452	$ (683)	$ (2,508)	$ (2,809)	$ (8,537)	$ (28,812)
Basic:
Net (loss) income from continuing operations	$ 0.11	$ (0.04)	$ 0.22	$ (0.41)	$ (0.27)	$ 0.00	$ 0.18	$ (0.11)	$ (0.12)	$ (0.20)
Net (loss) income	0.18	(0.07)	0.19	(0.45)	(0.31)	0.02	(0.04)	(0.14)	(0.15)	(0.46)
Diluted:
Net (loss) income from continuing operations	0.11	(0.04)	0.21	(0.41)	(0.27)	0.00	0.18	(0.11)	(0.12)	(0.20)
Net (loss) income	$ 0.18	$ (0.07)	$ 0.19	$ (0.45)	$ (0.31)	$ 0.02	$ (0.04)	$ (0.14)	$ (0.15)	$ (0.46)