CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 88,863	$ 86,959	$ 222,855	$ 266,525
Cost of sales	13,205	7,355	30,372	25,984
Gross margin	75,658	79,604	192,483	240,541
Operating expenses:
Selling, general and administrative	51,258	58,740	152,761	192,233
Investigation, restatement and related	7,242	16,269	46,374	31,307
Research and development	2,691	3,962	8,421	11,225
Amortization of intangible assets	269	260	769	758
Impairment of intangible asset	0	0	446	0
Operating income (loss)	14,198	373	(16,288)	5,018
Other income (expense)
Interest (expense) income, net	(2,255)	99	(2,313)	312
Other income, net	127	0	272	0
Income (loss) before income tax provision	12,070	472	(18,329)	5,330
Income tax provision benefit (expense)	309	(650)	225	915
Net income (loss)	$ 12,379	$ (178)	$ (18,104)	$ 6,245
Net income per common share - basic (in dollars per share)	$ 0.12	$ 0.00	$ (0.17)	$ 0.06
Net income per common share - diluted (in dollars per share)	$ 0.11	$ 0.00	$ (0.17)	$ 0.06
Weighted average shares outstanding - basic (in shares)	107,157,561	105,935,736	106,929,643	104,403,622
Weighted average shares outstanding - diluted (in shares)	109,590,008	105,935,736	106,929,643	109,177,577