Quarterly Financial Data - Condensed Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 108,537	$ 98,497	$ 104,075	$ 98,679	$ 104,622	$ 101,151	$ 100,954	$ 89,762	$ 409,788	$ 396,489	$ 402,277
Cost of sales	23,320	19,880	22,516	22,137	21,411	23,865	21,910	19,339	87,853	86,525	98,912
Gross profit	85,217	78,617	81,559	76,542	83,211	77,286	79,044	70,423	321,935	309,964	303,365
Operating expense	77,801	69,346	84,254	69,467	75,831	73,147	74,116	77,615	300,868	300,709
Operating income	7,416	9,271	(2,695)	7,075	7,380	4,139	4,928	(7,192)	21,067	9,255	17,136
Net income (loss) from continuing operations	(5,117)	10,384	(6,346)	4,576	2,106	(788)	4,077	(7,737)	3,497	(2,342)	(3,744)
Net income (loss)	$ (3,236)	$ 9,896	$ (7,444)	$ 3,840	$ 3,369	$ (1,371)	$ 3,572	$ (8,379)	$ 3,056	$ (2,809)	$ (8,537)
Net income (loss) per common share—basic
Net income (loss) from continuing operations	$ (0.29)	$ 0.57	$ (0.35)	$ 0.25	$ 0.11	$ (0.04)	$ 0.22	$ (0.41)	$ 0.19	$ (0.12)	$ (0.20)
Net income (loss)	(0.18)	0.55	(0.41)	0.21	0.18	(0.07)	0.19	(0.45)	0.17	(0.15)	(0.46)
Net income (loss) per common share—diluted
Net income (loss) from continuing operations	(0.29)	0.56	(0.35)	0.24	0.11	(0.04)	0.21	(0.41)	0.19	(0.12)	(0.20)
Net income (loss)	$ (0.18)	$ 0.54	$ (0.41)	$ 0.20	$ 0.18	$ (0.07)	$ 0.19	$ (0.45)	$ 0.17	$ (0.15)	$ (0.46)