Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ 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	$ 61,708	$ 91,057	$ 205,112	$ 281,368
Cost of sales	42,641	52,551	132,686	150,343
Gross profit	19,067	38,506	72,426	131,025
Operating expenses:
Selling and marketing	17,472	20,635	69,146	79,482
General and administrative	6,726	7,503	23,824	20,740
Research and development	3,122	4,208	11,282	12,744
Goodwill and intangible impairment charge	0	0	72,008	0
Total operating expenses	27,320	32,346	176,260	112,966
Operating (loss) income	(8,253)	6,160	(103,834)	18,059
Other (expense) income:
Interest income	0	269	162	835
Interest expense	(293)	(244)	(721)	(805)
Other, net	(129)	188	(351)	206
Total other (expense) income, net	(422)	213	(910)	236
(Loss) income from continuing operations before income taxes	(8,675)	6,373	(104,744)	18,295
Income tax expense (benefit)	1,900	1,870	(6,941)	4,645
(Loss) income from continuing operations	(10,575)	4,503	(97,803)	13,650
Discontinued operations:
Loss from discontinued operations before income taxes	(39)	(159)	(104)	(187)
Income tax expense of discontinued operations	75	35	225	167
Loss from discontinued operations	(114)	(194)	(329)	(354)
Net (loss) income	$ (10,689)	$ 4,309	$ (98,132)	$ 13,296	[1]
Earnings Per Share, Basic [Abstract]
Basic income per share from continuing operations (in dollars per share)	$ (0.36)	$ 0.15	$ (3.30)	$ 0.45
Basic loss per share from discontinued operation (in dollars per share)	0	(0.01)	(0.01)	(0.01)
Basic net income per share (in dollars per share)	(0.36)	0.14	(3.31)	0.44
Earnings Per Share, Diluted [Abstract]
Diluted income per share from continuing operations (in dollars per share)	(0.36)	0.15	(3.30)	0.45
Diluted loss per share from discontinued operation (in dollars per share)	0	(0.01)	(0.01)	(0.01)
Diluted net income per share (in dollars per share)	$ (0.36)	$ 0.14	$ (3.31)	$ 0.44
Shares used in per share calculations:
Basic (in shares)	29,728	30,185	29,660	30,230
Diluted (in shares)	29,728	30,433	29,660	30,500

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