Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales		$ 114,188	$ 59,004	$ 207,910	$ 143,404
Cost of sales		66,792	41,487	124,917	90,045
Gross profit		47,396	17,517	82,993	53,359
Operating expenses:
Selling and marketing		12,446	17,631	37,132	51,674
General and administrative		9,315	9,443	16,971	17,098
Research and development		3,728	3,849	7,543	8,160
Loss on disposal group and goodwill and other intangible impairment charge		29,013	72,008	29,013	72,008
Total operating expenses		54,502	102,931	90,659	148,940
Operating loss		(7,106)	(85,414)	(7,666)	(95,581)
Other expense:
Interest income		1	(3)	3	162
Interest expense		(338)	(223)	(965)	(428)
Other, net		115	171	156	(222)
Total other expense, net		(222)	(55)	(806)	(488)
Loss from continuing operations before income taxes		(7,328)	(85,469)	(8,472)	(96,069)
Income tax benefit		(2,342)	(6,725)	(5,788)	(8,841)
Loss from continuing operations		(4,986)	(78,744)	(2,684)	(87,228)
Discontinued operations:
Loss from discontinued operations before income taxes		(29)	(51)	(63)	(65)
Income tax expense of discontinued operations		95	73	179	150
Loss from discontinued operations		(124)	(124)	(242)	(215)
Net loss		$ (5,110)	$ (78,868)	$ (2,926)	$ (87,443)
Earnings Per Share, Basic [Abstract]
Basic income per share from continuing operations (in dollars per share)		$ (0.17)	$ (2.65)	$ (0.09)	$ (2.94)
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)	[1]	(0.17)	(2.66)	(0.10)	(2.95)
Earnings Per Share, Diluted [Abstract]
Diluted income per share from continuing operations (in dollars per share)		(0.17)	(2.65)	(0.09)	(2.94)
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)	[1]	$ (0.17)	$ (2.66)	$ (0.10)	$ (2.95)
Shares used in per share calculations:
Basic (in shares)		29,909	29,678	29,852	29,626
Diluted (in shares)		29,909	29,678	29,852	29,626

[1] May not add due to rounding.