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Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (2,021,000) $ (1,963,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 9,000 2,000
Share based compensation 620,000 143,000
Depreciation and amortization 46,000 58,000
Reserve for prepaid materials 96,000 0
Change in operating assets and liabilities:    
Contract assets (247,000) 0
Accounts receivable (124,000) 0
Prepaid expenses and other assets 127,000 57,000
Accounts payable and accrued liabilities 2,000 213,000
Accrued compensation and taxes 25,000 100,000
Contract liabilities (46,000) 0
Net cash used in operating activities (1,513,000) (1,390,000)
Cash flows from investing activities:    
Acquisition of fixed assets (54,000) 0
Disbursements for patents and other intangible assets (34,000) (78,000)
Net cash used in investing activities (88,000) (78,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 3,393,000 0
Proceeds from exercise of stock options 109,000 0
Net cash provided by financing activities 3,502,000 0
Net change in cash and cash equivalents 1,901,000 (1,468,000)
Cash and cash equivalents, beginning of period 8,824,000 8,552,000
Cash and cash equivalents, end of period $ 10,725,000 $ 7,084,000