CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 61,736	$ 66,555
Cost of sales	10,025	7,418
Gross profit	51,711	59,137
Operating expenses:
Selling, general and administrative	46,942	50,862
Investigation, restatement and related	15,592	18,107
Research and development	2,650	2,902
Amortization of intangible assets	271	233
Impairment of intangible asset	0	446
Operating loss	(13,744)	(13,413)
Other income (expense), net
Interest (expense) income, net	(2,387)	211
Other income (expense), net	6	(29)
Loss before income tax provision	(16,125)	(13,231)
Income tax provision benefit (expense)	11,304	(42)
Net loss	$ (4,821)	$ (13,273)
Net loss per common share - basic (in dollars per share)	$ (0.04)	$ (0.12)
Net loss per common share - diluted (in dollars per share)	$ (0.04)	$ (0.12)
Weighted average shares outstanding - basic (in shares)	107,538,509	106,420,317
Weighted average shares outstanding - diluted (in shares)	107,538,509	106,420,317