Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales		$ 93,722	$ 84,400
Cost of sales		58,125	48,558
Gross profit		35,597	35,842
Operating expenses:
Selling and marketing		24,686	34,043
General and administrative		7,656	7,655
Research and development		3,815	4,311
Total operating expenses		36,157	46,009
Operating loss		(560)	(10,167)
Other expense:
Interest income		2	165
Interest expense		(627)	(205)
Other, net		41	(393)
Total other expense, net		(584)	(433)
Loss from continuing operations before income taxes		(1,144)	(10,600)
Income tax benefit		(3,446)	(2,116)
Income (loss) from continuing operations		2,302	(8,484)
Discontinued operations:
Loss from discontinued operations before income taxes		(34)	(14)
Income tax expense of discontinued operations		84	77
Loss from discontinued operations		(118)	(91)
Net income (loss)		$ 2,184	$ (8,575)
Earnings Per Share, Basic [Abstract]
Basic income per share from continuing operations (in dollars per share)		$ 0.08	$ (0.29)
Basic loss per share from discontinued operation (in dollars per share)		0	0
Basic net income per share (in dollars per share)	[1]	0.07	(0.29)
Earnings Per Share, Diluted [Abstract]
Diluted income per share from continuing operations (in dollars per share)		0.08	(0.29)
Diluted loss per share from discontinued operation (in dollars per share)		0	0
Diluted net income per share (in dollars per share)	[1]	$ 0.07	$ (0.29)
Shares used in per share calculations:
Basic (in shares)		29,796	29,573
Diluted (in shares)		30,584	29,573

[1] May not add due to rounding.