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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flows from operating activities:    
Net loss $ (6,665,000) $ (5,031,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 27,000 8,000
Share based compensation 606,000 421,000
Depreciation and amortization 215,000 158,000
Impairment of intangible assets 236,000 0
Gain on forgiveness of Payroll Protection Program debt (251,000) 0
Change in operating assets and liabilities:    
Contract assets 92,000 (198,000)
Prepaid expenses (122,000) (78,000)
Other assets 133,000 31,000
Accounts payable and accrued liabilities (160,000) 65,000
Accrued compensation and taxes 441,000 483,000
Contract liabilities (94,000) (2,000)
Net cash used in operating activities (5,542,000) (4,143,000)
Cash Flows from investing activities:    
Acquisition of fixed assets (66,000) (4,000)
Disbursements for patents and other intangible assets (69,000) (151,000)
Net cash used in investing activities (135,000) (155,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 5,309,000 6,053,000
Proceeds from exercise of stock options and warrants 385,000 89,000
Proceeds from Payroll Protection Program loan 0 251,000
Net cash provided by financing activities 5,694,000 6,393,000
Net increase in cash and cash equivalents 17,000 2,095,000
Cash and cash equivalents, beginning of period 8,824,000 8,552,000
Cash and cash equivalents, end of period $ 8,841,000 $ 10,647,000