Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (8,268)	$ (7,937)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	303	288
Stock-based compensation	765	645
Paycheck Protection Program loan forgiveness	(646)
Gain on sale of equipment		(21)
(Increase) decrease in current assets:
Accounts receivable - trade	(52)	1
Accounts receivable - other		123
Other assets	12	11
Prepaid expenses	(52)	79
Inventory	(56)	235
Deposits		(8)
Increase (decrease) in current liabilities:
Accounts payable	(71)	139
Accrued expenses	286	(663)
Net cash used in operating activities	(7,779)	(7,108)
CASH FLOWS FROM INVESTING ACTIVITIES
Cash received on sale of property and equipment	1	47
Purchase of property and equipment	(100)	(114)
Net cash provided by (used in) investing activities	(99)	(67)
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	(39)	(73)
Repayments of finance lease obligations	(54)	(62)
Proceeds from the exercise of warrants	1,250	2,630
Payment of employee withholding taxes related to share based awards	(17)
Net cash provided by financing activities	13,561	8,882
NET CHANGE IN CASH	5,683	1,707
CASH AT BEGINNING OF PERIOD	3,643	1,936
CASH AT END OF PERIOD	9,326	3,643
SUPPLEMENTAL INFORMATION:
Interest paid	11	28
Income taxes paid
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Forgiveness of accrual in warrant exercise		238
Deemed dividend		$ 436