CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 53,367	$ 40,767
Cost of sales	7,946	5,148
Gross margin	45,421	35,619
Operating expenses:
Research and development expenses	2,496	1,831
Selling, general and administrative expenses	40,648	29,308
Amortization of intangible assets	810	233
Operating income	1,467	4,247
Other income (expense), net
Interest (expense), net	(56)	(14)
Income before income tax provision	1,411	4,233
Income tax provision	(214)	(146)
Net income	$ 1,197	$ 4,087
Net income per common share - basic (in dollars per share)	$ 0.01	$ 0.04
Net income per common share - diluted (in dollars per share)	$ 0.01	$ 0.04
Weighted average shares outstanding - basic	105,538,271	105,820,335
Weighted average shares outstanding - diluted	112,039,860	113,638,551