Quarterly Results of Operations (unaudited) - Schedule of Quarterly Results 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	$ 47,597	$ 43,648	$ 54,293	$ 46,767	$ 50,889	$ 60,027	$ 65,393	$ 65,135	$ 192,304	$ 241,443	$ 201,537
Gross profit	31,954	30,050	36,551	32,104	33,000	35,695	37,739	37,106	130,657	143,540	125,642
Operating expenses	29,765	29,138	33,165	28,990	27,832	22,240	21,986	21,030	121,058	93,087	87,554
Operating income	2,186	912	3,386	3,115	5,168	13,455	15,753	16,077	9,599	50,453	38,088
Income from Continuing Operations	5,042	494	2,826	2,199	3,485	11,186	13,866	13,657	10,561	42,194	32,611
Income (loss) from Discontinued Operations	(30)	(16)	(1)	0	(1)	(4)	(14)	(23)	(47)	(43)	873
Net income	$ 5,012	$ 478	$ 2,825	$ 2,199	$ 3,484	$ 11,182	$ 13,852	$ 13,634	$ 10,514	$ 42,151	$ 33,484
Basic income/(loss) per share:
Continuing operations	$ 0.13	$ 0.01	$ 0.07	$ 0.06	$ 0.09	$ 0.28	$ 0.35	$ 0.34	$ 0.27	$ 1.07	$ 0.83
Discontinued operations	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.02
Total net income per share	0.13	0.01	0.07	0.06	0.09	0.28	0.35	0.34	0.27	1.07	0.85
Diluted income/(loss) per share:
Continuing operations	0.13	0.01	0.07	0.06	0.09	0.28	0.35	0.34	0.27	1.06	0.83
Discontinued operations	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.02
Total net income per share	$ 0.13	$ 0.01	$ 0.07	$ 0.06	$ 0.09	$ 0.28	$ 0.35	$ 0.34	$ 0.27	$ 1.06	$ 0.85