Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 4,106	$ 8,425
Cost of sales	3,545	5,280
Gross profit	561	3,145
Operating expenses:
Product development	771	804
Selling, general, and administrative	3,631	4,310
Restructuring	674	0
Total operating expenses	5,076	5,114
Loss from operations	(4,515)	(1,969)
Other expenses (income):
Other expenses (income)	7	(3)
Loss from continuing operations before income taxes	(4,522)	(1,966)
Provision for income taxes	0	11
Loss from continuing operations	(4,522)	(1,977)
Discontinued operations:
Loss on disposal of discontinued operations	0	(12)
Loss from discontinued operations	0	(12)
Net loss	$ (4,522)	$ (1,989)
Net loss per share - basic:
From continuing operations (in dollars per share)	$ (0.39)	$ (0.17)
From discontinued operations (in dollars per share)	0.00	0.00
Net loss per share - basic (in dollars per share)	(0.39)	(0.17)
Net loss per share - diluted:
From continuing operations (in dollars per share)	(0.39)	(0.17)
From discontinued operations (in dollars per share)	0.00	0.00
Net loss per share - diluted (in dollars per share)	$ (0.39)	$ (0.17)
Weighted average shares used in computing net loss per share:
Basic (in shares)	11,718	11,650
Diluted (in shares)	11,718	11,650