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	$ 2,915	$ 5,158	$ 9,174	$ 14,989
Cost of sales	1,887	3,877	8,157	11,596
Gross profit	1,028	1,281	1,017	3,393
Operating expenses:
Product development	191	638	1,035	1,940
Selling, general, and administrative	1,689	2,543	5,524	7,611
Restructuring	(19)	1	243	(46)
Total operating expenses	1,861	3,182	6,802	9,505
Loss from operations	(833)	(1,901)	(5,785)	(6,112)
Other expenses (income):
Interest expense	67	2	136	4
Other expenses (income)	46	17	144	(2)
Net loss	$ (946)	$ (1,920)	$ (6,065)	$ (6,114)
Net loss per share - basic and diluted (in dollars per share)	$ (0.08)	$ (0.16)	$ (0.49)	$ (0.51)
Weighted average shares used in computing net loss per share:
Basic and diluted (in shares)	12,370	12,059	12,278	11,970