CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 67,437	$ 95,417	$ 133,992	$ 179,566
Cost of sales	9,749	9,270	17,167	18,628
Gross margin	57,688	86,147	116,825	160,938
Operating expenses:
Selling, general and administrative	50,641	67,582	101,503	133,492
Investigation, restatement and related	21,025	12,925	39,132	15,038
Research and development	2,828	3,719	5,730	7,264
Amortization of intangible assets	267	246	500	498
Impairment of intangible assets	0	0	446	0
Operating (loss) income	(17,073)	1,675	(30,486)	4,646
Other income (expense), net
Interest (expense) income, net	(269)	116	(58)	212
Other income, net	174	0	145	0
(Loss) income before income tax provision	(17,168)	1,791	(30,399)	4,858
Income tax provision (expense) benefit	(42)	13	(84)	1,565
Net (loss) income	$ (17,210)	$ 1,804	$ (30,483)	$ 6,423
Net (loss) income per common share - basic (in dollars per share)	$ (0.16)	$ 0.02	$ (0.29)	$ 0.06
Net (loss) income per common share - diluted (in dollars per share)	$ (0.16)	$ 0.02	$ (0.29)	$ 0.06
Weighted average shares outstanding - basic (in shares)	106,942,429	105,694,789	106,885,893	104,522,051
Weighted average shares outstanding - diluted (in shares)	106,942,429	111,107,093	106,885,893	111,855,543