CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net loss	$ (9,527)	$ (8,534)	$ (7,940)
Adjustments to reconcile net loss to net cash used by operating activities
Depreciation and amortization	129	164	179
Amortization of debt discounts and debt issuance costs	145	438	426
Stock-based compensation	1,162	960	856
Write down of capitalized labor inventory to net realizable value		281
Reduction in accounts payable and accrued expenses from expiration of statute of limitations	(200)		(224)
Warrants modified/issued in lieu of cash as compensation for services		80	53
Change in assets and liabilities
Accounts receivable	62	(83)	35
Inventory	23	589	(411)
Other assets	(50)	17	62
Accounts payable	227	(261)	188
Accrued expenses	94	(76)	130
Deferred revenue	(13)	(768)	165
Pension obligation	37	10	59
Total adjustments	1,616	1,351	1,518
Net cash used by operating activities	(7,911)	(7,183)	(6,422)
Cash flows from investing activities
Purchase of property and equipment	(49)	(87)	(117)
Net cash used by investing activities	(49)	(87)	(117)
Cash flows from financing activities
Proceeds from line of credit, net	2,650	400	1,550
Proceeds from exercise of stock options	3	33	67
Proceeds from issuance of preferred stock, net of issuance costs	3,593	9,955
Dividends paid to preferred stockholders	(51)	(51)	(51)
Proceeds from exercised warrants to purchase stock			2,848
Net cash provided by financing activities	6,195	10,337	4,414
Effect of exchange rate changes on cash	(1)	67	(20)
Net increase (decrease in cash)	(1,766)	3,134	(2,145)
Cash at beginning of year	3,352	218	2,363
Cash at end of year	1,586	3,352	218
Supplemental disclosure of cash flow information:
Cash paid for interest		1	2
Cash paid for income taxes			1
Summary of non-cash investing and financing activities:
Conversion of related party notes payable into common stock			85
Conversion of related party notes payable into Series E Preferred		1,978
Beneficial conversion feature of convertible debt	219	146	296
Accrued unpaid dividends on Series E Preferred		240
Stock dividend on Series E Preferred	1,228	774
Stock dividend on Series F Preferred	63	240
Stock dividend on Series G Preferred	5
Issuance of Common Stock pursuant to cashless warrant exercises	1	1	9
Exchange of Common Stock for Series G Preferred	34
Reduction (increase in additional minimum pension liability)	(347)	332	(744)
Reclassification of warrants previously classified as derivative liabilities to additional paid-in capital			57
Issuance of common warrants securing line of credit borrowing facility			128
Issuance of restricted stock pursuant to achievement of vesting conditions			$ 1