CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (1,885)	$ (3,124)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	18	18
Loss on disposal of fixed assets	82	0
Stock-based compensation	78	124
Issuance of common stock in exchange for unexercised options	0	62
Issuance of common stock as compensation in lieu of cash	21	0
Change in fair value of derivative liabilities	1,172	197
Loss on extinguishment of derivative liabilities	(335)	0
Change in assets and liabilities
Accounts receivable	84	168
Inventory	(48)	(64)
Other assets	(495)	30
Operating lease right-of-use assets	(10)	(3)
Accounts payable	(33)	662
Deferred revenue	(129)	234
Accrued expense	(123)	102
Pension obligation	(13)	8
Total adjustments	(1,405)	1,144
Net cash used in operating activities	(3,290)	(1,980)
Cash flows from investing activities
Purchase of property and equipment	(53)	0
Net cash used in investing activities	(53)	0
Cash flows from financing activities
Proceeds from issuance of common stock, net	0	622
Proceeds from issuance of related party notes payable	0	350
Net cash provided by financing activities	0	972
Effect of exchange rate changes on cash	54	31
Net decrease in cash and cash equivalents	(3,289)	(977)
Cash and cash equivalents at beginning of period	8,345	1,030
Cash and cash equivalents at end of period	5,056	53
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:
Stock dividends on Series A Convertible Redeemable Preferred Stock	92	937
Stock dividends on Series A-1 Convertible Redeemable Preferred Stock	83	250
Stock dividends on Series D Convertible Redeemable Preferred Stock	248	0
Accretion of discount on Series C Convertible Redeemable Preferred Stock	0	175
Accretion of discount on Series D Convertible Redeemable Preferred Stock	1,817	0
Conversion of Series A Convertible Redeemable Preferred Stock into Common Stock	438	0
Conversion of Series A-1 Convertible Redeemable Preferred Stock into Common Stock	443	0
Stock subscription receivable	$ 0	$ 765