Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities:
Net loss	$ (2,976)	$ (3,589)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	39	41
Amortization	196	157
Provision for inventory reserve	(2)	94
Accretion of contract liability		8
Share-based compensation	121	264
Bad debt	(59)
Impairment charge		44
Changes in operating assets and liabilities:
Decrease in accounts receivable	11	405
Decrease (increase) in inventories	43	(480)
(Increase) decrease in prepaid expenses and other current assets	(415)	461
Decrease in deferred revenue	(46)
Decrease in accounts payable and accrued expenses	(112)	(436)
Net cash used in operating activities	(3,200)	(3,031)
Cash Flows From Financing Activities:
Repayment of term note		(100)
Deferred offering costs	(125)	(109)
Proceeds from registered direct offering of common stock, net of offering costs	1,927	5,250
Net cash provided by financing activities	1,802	5,041
Net (decrease) increase in cash	(1,398)	2,010
Cash at beginning of period	1,866	879
Cash at end of period	468	2,889
Cash paid during the period for:
Interest		$ 2