CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net loss	$ (8,534)	$ (7,940)	$ (9,849)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	164	179	125
Amortization of debt discount and debt issuance costs	438	426	217
Stock-based compensation	$ 960	$ 856	6,116
Change in fair value of derivative liabilities			4,776
Write down of capitalized labor inventory to net realizable value	$ 281
Reduction in accounts payable and accrued expenses from expiration of statute of limitations		$ (224)	(440)
Warrants modified/issued in lieu of cash as compensation for services	$ 80	53	108
Change in assets and liabilities
Accounts receivable	(83)	35	26
Inventory	589	(411)	(243)
Other assets	17	62	(50)
Accounts payable	(261)	188	(130)
Accrued expenses	(76)	130	(116)
Deferred revenue	(768)	165	102
Pension obligation	10	59	7
Total adjustments	1,351	1,518	4,998
Net cash used in operating activities	(7,183)	(6,422)	(4,851)
Cash flows from investing activities
Purchase of property and equipment	(87)	(117)	(193)
Net cash used in investing activities	(87)	(117)	$ (193)
Cash flows from financing activities
Proceeds from line of credit, net	400	1,550
Proceeds from exercise of stock options	(33)	$ 67	$ 11
Proceeds from issuance of preferred stock, net of issuance costs	9,955
Dividends paid to preferred stockholders	$ (51)	$ (51)	$ (51)
Proceeds from exercised warrants to purchase stock		2,848	3,291
Net cash provided by financing activities	$ 10,337	4,414	3,251
Effect of exchange rate changes on cash and cash equivalents	67	(20)	(69)
Net increase (decrease) in cash and cash equivalents	3,134	(2,145)	(1,862)
Cash and cash equivalents at beginning of year	218	2,363	4,225
Cash and cash equivalents at end of year	3,352	218	$ 2,363
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 1	2
Cash paid for income taxes		1	$ 1
Summary of non-cash investing and financing activities:
Conversion of related party notes payable into common stock		$ 85	$ 10
Conversion of related party notes payable into Series E Preferred	$ 1,978
Beneficial conversion feature of convertible debt	146	$ 296
Stock dividend on Series E Preferred	774
Accrued unpaid dividends on Series E Preferred	240
Issuance of common stock pursuant to cashless warrant exercises	1	$ 9	$ 45
Reduction (increase) in additional minimum pension liability	$ 332	(744)	(622)
Reclassification of warrants previously classified as derivative liabilities to additional paid-in capital		57	6,684
Issuance of common warrants securing line of credit borrowing facility		128	580
Issuance of restricted stock pursuant to achievement of vesting conditions		$ 1	$ 1