CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 66,555	$ 84,149
Cost of sales	7,418	9,358
Gross margin	59,137	74,791
Operating expenses:
Selling, general and administrative	50,862	65,910
Investigation, restatement and related	18,107	2,113
Research and development	2,902	3,545
Amortization of intangible assets	233	252
Impairment of intangible assets	446	0
Operating (loss) income	(13,413)	2,971
Other income (expense)
Interest income, net	211	96
Other expense, net	(29)	0
(Loss) income before income tax provision	(13,231)	3,067
Income tax provision (expense) benefit	(42)	1,552
Net (loss) income	$ (13,273)	$ 4,619
Net (loss) income per common share - basic (in dollars per share)	$ (0.12)	$ 0.04
Net (loss) income per common share - diluted (in dollars per share)	$ (0.12)	$ 0.04
Weighted average shares outstanding - basic (in shares)	106,420,317	104,747,411
Weighted average shares outstanding - diluted (in shares)	106,420,317	113,709,387