CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales	$ 9,347	$ 10,063	$ 27,535	$ 27,133
Cost of sales	4,753	5,002	13,673	14,049
Gross profit	4,594	5,061	13,862	13,084
Other costs and expenses:
Research and development	610	681	2,015	1,941
Professional services	421	292	1,291	1,045
Salaries and related costs	2,080	2,192	6,783	6,492
Selling, general and administrative	2,617	2,141	7,950	6,354
Total other costs and expenses	5,728	5,306	18,039	15,832
Loss from operations	(1,134)	(245)	(4,177)	(2,748)
Interest expense, net	(36)	(37)	(103)	(125)
Change in fair value of derivative liabilities	(69)	(683)	57	(555)
Total other loss, net	(105)	(720)	(46)	(680)
Loss before income taxes	(1,239)	(965)	(4,223)	(3,428)
Income tax expense	6	0	15	0
Net loss	$ (1,245)	$ (965)	$ (4,238)	$ (3,428)
Loss per share
Basic (in dollars per share)	$ (0.04)	$ (0.04)	$ (0.14)	$ (0.13)
Diluted (in dollars per share)	$ (0.04)	$ (0.04)	$ (0.14)	$ (0.13)
Weighted average number of shares outstanding - basic (in shares)	31,078	27,075	30,932	27,059
Weighted average number of shares outstanding - dilutive (in shares)	31,078	27,075	30,932	27,059