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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:    
Net loss $ (5,299) $ (5,194)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 29 10
Share-based compensation 528 614
Depreciation and amortization 186 299
Impairment of fixed assets   81
Impairment of intangible assets 20 14
Gain from sale of fixed assets   (5)
Right-of-use asset amortization 86 125
Realized gain from marketable securities   (79)
Lease amendments (3) (14)
Change in operating assets and liabilities:    
Contract assets (5) (168)
Accounts receivable 122 (208)
Prepaid expenses and other assets (104) 18
Other long term assets   10
Accounts payable, accrued liabilities, and lease liabilities 816 (57)
Accrued compensation and related taxes 294 452
Contract liabilities (1,043) 869
Net cash used in operating activities (4,373) (3,233)
Cash flows from investing activities:    
Acquisition of fixed assets (39)  
Disbursements for patents and other intangible assets (179) (200)
Proceeds from sale of fixed assets   5
Purchases of held-to-maturity short-term U.S. treasuries   (2,162)
Redemption of held-to-maturity short-term U.S. treasuries   4,847
Net cash provided by (used in) investing activities (218) 2,490
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 12,967 0
Proceeds from exercise of warrants 25  
Taxes paid related to share-based compensation (46) (15)
Net cash provided by (used in) financing activities 12,946 (15)
Effect of exchange rate changes on cash and cash equivalents (4) (9)
Net change in cash and cash equivalents 8,351 (767)
Cash and cash equivalents, beginning of period 5,684 6,451
Cash and cash equivalents, end of period 14,035 5,684
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation 326 234
Prepaid expenses repurposed to fixed assets as demonstration equipment   209
Non-cash impact of new lease $ 32 $ 34