CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net loss	$ (12,550)	$ (10,069)
Adjustments to reconcile net loss to net cash used by operating activities
Depreciation and amortization	51	68
Amortization of debt discounts and debt issuance costs	170	209
Stock-based compensation	1,272	1,094
Provision for losses on accounts receivable	0	15
Gain from sale of trademark	0	(50)
Reduction in accrued expenses from expiration of statute of limitations	0	(222)
Warrants issued in lieu of cash as compensation for services	26	57
Loss from change in fair value of derivative liabilities	232	0
Change in assets and liabilities
Accounts receivable	(414)	(186)
Inventory	50	(56)
Other assets	(229)	(40)
Accounts payable	(221)	32
Accrued expense	600	359
Deferred revenue	200	(29)
Pension obligation	61	115
Total adjustments	2,240	1,366
Net cash used by operating activities	(10,310)	(8,703)
Cash flows from investing activities
Purchase of property and equipment	(240)	(5)
Proceeds from sale of trademark	0	50
Net cash provided by (used by) investing activities	(240)	45
Cash flows from financing activities
Proceeds from line of credit	0	3,350
Proceeds from exercise of stock options	162	259
Proceeds from issuance of preferred stock, net of issuance costs	8,789	10,937
Dividends paid to preferred stockholders	(51)	(51)
Net cash provided by financing activities	8,900	14,495
Effect of exchange rate changes on cash and cash equivalents	27	(106)
Net increase (decrease) in cash and cash equivalents	(1,623)	5,731
Cash and cash equivalents at beginning of year	7,317	1,586
Cash and cash equivalents at end of year	5,694	7,317
Supplemental disclosure of cash flow information:
Cash paid for interest	0	0
Cash paid for income taxes	0	0
Summary of non-cash investing and financing activities:
Exchange of related-party indebtedness for Series A Preferred Stock	6,802	0
Beneficial conversion feature of related party lines of credit	30	302
Stock dividends on Series A Convertible Preferred Stock	3,251	923
Stock dividends on Series C Convertible Redeemable Preferred Stock	319	0
Stock dividends on Series E, Series F and Series G Convertible Preferred Stocks	0	1,426
Conversion of Series A Convertible Preferred Stock into Common Stock	4	0
Recognition of derivative liabilities on preferred stock issuance	833	0
Deemed dividend on preferred stock modification	92	0
Accretion of discount on Series C Convertible Redeemable Preferred Stock	200	0
Reduction (increase) in additional minimum pension liability	209	(15)
Preferred stock exchange	$ 0	$ 1,245