CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 187,296	$ 118,223	$ 59,181
Cost of sales	20,202	12,665	9,328
Gross margin	167,094	105,558	49,853
Operating expenses:
Research and development expenses	8,413	7,050	4,843
Selling, general and administrative expenses	133,384	90,480	46,227
Impairment of intangible assets	0	0	368
Amortization of intangible assets	933	928	1,054
Operating income (loss)	24,364	7,100	(2,639)
Other income (expense), net
Amortization of debt discount	0	0	(1,328)
Interest expense, net	(86)	(48)	(45)
Income (loss) before income tax provision	24,278	7,052	(4,012)
Income tax provision	5,168	(832)	(100)
Net income (loss)	$ 29,446	$ 6,220	$ (4,112)
Net income (loss) per common share - basic (in dollars per share)	$ 0.28	$ 0.06	$ (0.04)
Net income (loss) per common share - diluted (in dollars per share)	$ 0.26	$ 0.05	$ (0.04)
Weighted average shares outstanding - basic (in shares)	105,929,205	105,793,008	96,285,504
Weighted average shares outstanding - diluted (in shares)	113,628,482	113,295,504	96,285,504