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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (5,194) $ (5,758)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 10 26
Share-based compensation 614 373
Depreciation and amortization 299 161
Gain from sale of fixed assets (5) (38)
Right of use asset amortization 125 131
Realized gain from marketable securities (79) (45)
Lease amendments (14)  
Impairment of fixed assets 81  
Impairment of intangible assets 14 19
Change in operating assets and liabilities:    
Contract assets (168) 19
Accounts receivable (208) (46)
Prepaid expenses and other assets 18 (232)
Other long term assets 10  
Accounts payable and accrued liabilities (57) (125)
Accrued compensation and related taxes 452 360
Contract liabilities 869 163
Net cash used in operating activities (3,233) (4,992)
Cash flows from investing activities:    
Acquisition of fixed assets   (10)
Disbursements for patents and other intangible assets (200) (154)
Proceeds from sale of fixed assets 5 39
Purchases of held-to-maturity short-term U.S. treasuries (2,162) (5,898)
Redemption of held-to-maturity short-term U.S. treasuries 4,847 3,337
Net cash provided by (used in) investing activities 2,490 (2,686)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 0 6,539
Taxes paid related to vesting of restricted stock units (15)  
Net cash (used in) provided by financing activities (15) 6,539
Effect of exchange rate changes on cash and cash equivalents (9) (17)
Net change in cash and cash equivalents (767) (1,156)
Cash and cash equivalents, beginning of year 6,451 7,607
Cash and cash equivalents, end of year 5,684 6,451
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