Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (3,946)	$ (4,653)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	148	213
Stock-based compensation	291	471
Gain on sale of equipment	(18)	2
Loss on change in fair value of derivative		1
(Increase) decrease in current assets:
Accounts receivable - trade	(19)	(17)
Accounts receivable - other	123
Other assets	11	4
Prepaid expenses	(27)	13
Inventory	45	(70)
Increase (decrease) in current liabilities:
Accounts payable	375	82
Accrued expenses	(556)	53
Deferred rent		(6)
Net cash used in operating activities	(3,573)	(3,907)
CASH FLOWS FROM INVESTING ACTIVITIES
Cash received on sale of property and equipment	44
Purchase of property and equipment		(47)
Net cash provided by (used in) investing activities	44	(47)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of common stock, net	5,743
Proceeds from the issuance of notes payable	646
Repayments of notes payable	(29)	(112)
Repayments of finance lease obligations	(49)	(38)
Proceeds from the exercise of warrants		1,783
Payment of employee withholding taxes relating to share-based awards		(24)
Net cash provided by financing activities	6,311	1,609
NET CHANGE IN CASH	2,782	(2,345)
CASH AT BEGINNING OF PERIOD	1,936	4,920
CASH AT END OF PERIOD	4,718	2,575
SUPPLEMENTAL INFORMATION:
Interest paid	15	24
Income taxes paid
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Forgiveness of accrual in warrant exercise	238
Deemed dividend	414
Common stock issued on accrued bonus		$ 32