Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (4,440)	$ (6,665)
Adjustments to reconcile net loss to net cash used in operating activities:
Common stock issued for services	21	27
Share based compensation	307	606
Depreciation and amortization	113	215
Impairment of intangible assets		236
Gain from sale of fixed assets	(37)
Gain on forgiveness of Payroll Protection Program Loan and interest		(251)
Change in operating assets and liabilities:
Contract assets	(245)	92
Accounts receivable	(5)
Prepaid expenses and other assets	(161)	11
Accounts payable and accrued liabilities	17	(160)
Accrued compensation and related taxes	189	441
Contract liabilities	(23)	(94)
Net cash used in operating activities	(4,264)	(5,542)
Cash flows from investing activities:
Acquisition of fixed assets	(5)	(66)
Disbursements for patents and other intangible assets	(114)	(69)
Proceeds from sale of fixed assets	37
Purchases of held-to-maturity short-term US treasuries	(3,900)
Net cash used in investing activities	(3,982)	(135)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs	6,539	5,309
Proceeds from exercise of stock options and warrants		385
Net cash provided by financing activities	6,539	5,694
Effect of exchange rate changes on cash and cash equivalents	(20)
Net change in cash and cash equivalents	(1,727)	17
Cash and cash equivalents, beginning of period	7,607	8,824
Cash and cash equivalents, end of period	5,880	8,841
Supplemental disclosure of cash flow information:
Officer and employee equity awards for prior year accrued compensation	$ 107	$ 217

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