Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ 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		$ 59,004	$ 75,498	$ 143,404	$ 190,311
Cost of sales		41,487	41,850	90,045	97,792
Gross profit		17,517	33,648	53,359	92,519
Operating expenses:
Selling and marketing		17,631	22,084	51,674	58,847
General and administrative		9,443	6,327	17,098	13,237
Research and development		3,849	4,035	8,160	8,536
Goodwill and intangible impairment charge		72,008	0	72,008	0
Total operating expenses		102,931	32,446	148,940	80,620
Operating (loss) income		(85,414)	1,202	(95,581)	11,899
Other (expense) income:
Interest income		(3)	294	162	566
Interest expense		(223)	(268)	(428)	(561)
Other, net		171	31	(222)	18
Total other (expense) income, net		(55)	57	(488)	23
(Loss) income from continuing operations before income taxes		(85,469)	1,259	(96,069)	11,922
Income tax (benefit) expense		(6,725)	252	(8,841)	2,775
(Loss) income from continuing operations		(78,744)	1,007	(87,228)	9,147
Discontinued operations:
Loss from discontinued operations before income taxes		(51)	(11)	(65)	(28)
Income tax expense of discontinued operations		73	68	150	132
Loss from discontinued operations		(124)	(79)	(215)	(160)
Net (loss) income		$ (78,868)	$ 928	$ (87,443)	$ 8,987	[1]
Earnings Per Share, Basic [Abstract]
Basic income per share from continuing operations (in dollars per share)		$ (2.65)	$ 0.03	$ (2.94)	$ 0.30
Basic loss per share from discontinued operation (in dollars per share)		0	0	(0.01)	(0.01)
Basic net income per share (in dollars per share)	[2]	(2.66)	0.03	(2.95)	0.30
Earnings Per Share, Diluted [Abstract]
Diluted income per share from continuing operations (in dollars per share)		(2.65)	0.03	(2.94)	0.30
Diluted loss per share from discontinued operation (in dollars per share)		0	0	(0.01)	(0.01)
Diluted net income per share (in dollars per share)	[2]	$ (2.66)	$ 0.03	$ (2.95)	$ 0.29
Shares used in per share calculations:
Basic (in shares)		29,678	30,193	29,626	30,253
Diluted (in shares)		29,678	30,476	29,626	30,533

[1]

[2] May not add due to rounding.