Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 7,126	$ 16,232	$ 15,551	$ 28,819
Cost of sales	4,604	8,792	9,884	16,228
Gross profit	2,522	7,440	5,667	12,591
Operating expenses:
Product development	854	654	1,658	1,196
Selling, general, and administrative	5,590	3,629	9,900	6,969
Total operating expenses	6,444	4,283	11,558	8,165
(Loss) income from operations	(3,922)	3,157	(5,891)	4,426
Other expenses (income):
Interest expense	0	26	0	49
Other (income) expenses	(6)	16	(9)	38
(Loss) income from continuing operations before income taxes	(3,916)	3,115	(5,882)	4,339
Provision for income taxes	0	923	11	923
(Loss) income from continuing operations	(3,916)	2,192	(5,893)	3,416
Discontinued operations:
Loss from discontinued operations	0	(45)	0	(114)
Loss on disposal of discontinued operations	0	(36)	(12)	(72)
Loss from discontinued operations before income taxes	0	(81)	(12)	(186)
Benefit from income taxes	0	0	0	(10)
Loss from discontinued operations	0	(81)	(12)	(176)
Net (loss) income	$ (3,916)	$ 2,111	$ (5,905)	$ 3,240
Net (loss) income per share - basic:
From continuing operations (in dollars per share)	$ (0.34)	$ 0.22	$ (0.51)	$ 0.35
From discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.02)
Net income (loss) per share - basic (in dollars per share)	(0.34)	0.21	(0.51)	0.33
Net (loss) income per share - diluted:
From continuing operations (in dollars per share)	(0.34)	0.22	(0.51)	0.34
From discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.02)
Net income (loss) per share - diluted (in dollars per share)	$ (0.34)	$ 0.21	$ (0.51)	$ 0.32
Weighted average shares used in computing net (loss) income per share:
Basic (in shares)	11,657	10,019	11,653	9,846
Diluted (in shares)	11,657	10,138	11,653	10,058