CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 64,429	$ 49,015	$ 175,139	$ 135,461
Cost of sales	7,997	4,979	23,338	15,217
Gross margin	56,432	44,036	151,801	120,244
Operating expenses:
Research and development expenses	2,919	2,187	8,582	6,072
Selling, general and administrative expenses	48,179	34,901	131,599	96,860
Amortization of intangible assets	631	234	1,889	699
Operating income	4,703	6,714	9,731	16,613
Other income (expense), net
Interest income (expense), net	(87)	(5)	(254)	(18)
Income before income tax provision	4,616	6,709	9,477	16,595
Income tax provision	(1,295)	(158)	(2,984)	(527)
Net income	$ 3,321	$ 6,551	$ 6,493	$ 16,068
Net income per common share - basic (in dollars per share)	$ 0.03	$ 0.06	$ 0.06	$ 0.15
Net income per common share - diluted (in dollars per share)	$ 0.03	$ 0.06	$ 0.06	$ 0.14
Weighted average shares outstanding - basic (in shares)	105,991,990	106,511,294	105,927,890	106,178,136
Weighted average shares outstanding - diluted (in shares)	112,361,179	114,556,036	112,193,701	114,110,120