CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 299,255	$ 359,111	$ 321,139
Cost of sales	43,081	36,386	35,219
Gross profit	256,174	322,725	285,920
Operating expenses:
Selling, general and administrative	198,205	258,528	220,119
Investigation, restatement and related	66,504	51,322	0
Research and development	11,140	15,765	17,900
Amortization of intangible assets	1,039	1,034	1,678
Impairment of intangible assets	446	0	0
Operating (loss) income	(21,160)	(3,924)	46,223
Other income (expense)
Loss on divestiture of Stability	0	0	(1,048)
Interest (expense) income, net	(4,708)	527	(87)
Other income, net	283	0	0
(Loss) income before income tax provision	(25,585)	(3,397)	45,088
Income tax provision benefit (expense)	5	(26,582)	19,639
Net (loss) income	$ (25,580)	$ (29,979)	$ 64,727
Net (loss) income per common share - basic (in dollars per share)	$ (0.24)	$ (0.28)	$ 0.61
Net (loss) income per common share - diluted (in dollars per share)	$ (0.24)	$ (0.28)	$ 0.56
Weighted average shares outstanding - basic (in shares)	106,946,384	105,596,256	106,121,810
Weighted average shares outstanding - diluted (in shares)	106,946,384	105,596,256	116,113,736