Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (5,774)	$ (5,865)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	229	219
Stock-based compensation	550	453
Paycheck Protection Program loan forgiveness	(646)
Paycheck Protection Program loan accrued interest forgiveness	(4)
Gain on sale of equipment	(1)	(18)
(Increase) decrease in current assets:
Accounts receivable - trade	(54)	(4)
Accounts receivable - other		123
Other assets	11	2
Prepaid expenses	(403)	(24)
Inventory	(62)	78
Increase (decrease) in current liabilities:
Accounts payable	(137)	179
Accrued expenses	258	(639)
Net cash used in operating activities	(6,033)	(5,496)
CASH FLOWS FROM INVESTING ACTIVITIES
Cash received on sale of property and equipment	1	44
Purchase of property and equipment	(84)	(48)
Net cash provided by (used in) investing activities	(83)	(4)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of common stock, net	12,421	5,741
Proceeds from the issuance of notes payable		646
Repayments of notes payable	(36)	(44)
Repayments of finance lease obligations	(40)	(62)
Proceeds from the exercise of warrants	1,228
Payment of employee withholding taxes related to share based awards	(17)
Net cash provided by financing activities	13,556	6,281
NET CHANGE IN CASH	7,440	781
CASH AT BEGINNING OF PERIOD	3,643	1,936
CASH AT END OF PERIOD	11,083	2,717
SUPPLEMENTAL INFORMATION:
Interest paid	9	22
Income taxes paid
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Forgiveness of accrual in warrant exercise		238
Deemed dividend		$ 414