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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (2,907) $ (3,128)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 5 14
Share-based compensation 300 130
Depreciation and amortization 158 13
Gain from sale of fixed assets (5) (37)
Right of use asset amortization 73 59
Realized gain from marketable securities (60)  
Lease Amendments (14)  
Impairment of intangible assets 14  
Change in operating assets and liabilities:    
Contract assets 17 (448)
Accounts receivable 40 33
Prepaid expenses and other assets (207) (260)
Accounts payable and accrued liabilities 58 102
Accrued compensation and related taxes 162 175
Contract liabilities 1,858  
Net cash used in operating activities (508) (3,347)
Cash flows from investing activities:    
Acquisition of fixed assets   (5)
Disbursements for patents and other intangible assets (56) (73)
Proceeds from sale of fixed assets 5 37
Purchases of held-to-maturity short-term US treasuries (2,162)  
Redemption of held-to-maturity US treasuries 3,897  
Net cash provided by (used in) investing activities 1,684 (41)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs   4,798
Taxes paid related to vesting of restricted stock units (15)  
Net cash (used in) provided by financing activities (15) 4,798
Effect of exchange rate changes on cash and cash equivalents (12) (10)
Net change in cash and cash equivalents 1,149 1,400
Cash and cash equivalents, beginning of period 6,451 7,607
Cash and cash equivalents, end of period 7,600 9,007
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation 234 $ 107
Prior year prepaid expenses repurposed to fixed assets as demonstration equipment 209  
Non-cash impact of new lease $ 34