CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (6,160)	$ (5,869)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	36	24
Amortization of debt issuance costs and beneficial conversion feature	0	122
Stock-based compensation	347	708
Warrants issued in lieu of cash as compensation for services	8	9
Change in fair value of derivative liabilities	(57)	0
Change in assets and liabilities
Accounts receivable	592	(118)
Inventory	(290)	60
Other assets	8	(44)
Operating lease right-of-use assets	106	0
Accounts payable	(127)	(67)
Deferred revenue	(142)	(464)
Accrued expense	473	389
Contract costs	(29)	0
Pension obligation	52	14
Total adjustments	977	633
Net cash used in operating activities	(5,183)	(5,236)
Cash flows from investing activities
Purchase of property and equipment	(8)	(7)
Net cash used in investing activities	(8)	(7)
Cash flows from financing activities
Proceeds from issuance of common stock, net of financing costs	6,095	0
Dividends paid	(25)	(25)
Proceeds from exercised stock options	166	149
Net cash provided by financing activities	6,236	124
Effect of exchange rate changes on cash	(5)	15
Net increase (decrease) in cash and cash equivalents	1,040	(5,104)
Cash and cash equivalents at beginning of period	5,694	7,317
Cash and cash equivalents at end of period	6,734	2,213
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:
Beneficial conversion feature of convertible related party lines of credit	0	21
Stock dividends on Series A Convertible Preferred Stock	1,794	1,464
Stock dividends on Series C Convertible Redeemable Preferred Stock	479	0
Accretion of discount on Series C Convertible Redeemable Preferred Stock	(370)	0
Recognition of operating lease right-of-use assets from adoption of ASC 842	2,265	0
Recognition of lease liabilities from adoption of ASC 842	(2,280)	0
Conversion of Convertible Preferred Stock into Common Stock	$ 0	$ 4