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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (2,980) $ (2,907)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 6 5
Share-based compensation 411 300
Reserve for share-based compensation tax withholdings (29)  
Depreciation and amortization 91 158
Impairment of intangible assets 0 14
Gain from sale of fixed assets   (5)
Right of use asset amortization 43 73
Realized gain from marketable securities   (60)
Lease amendments (3) (14)
Change in operating assets and liabilities:    
Contract assets 183 17
Accounts receivable 152 40
Prepaid expenses and other assets (238) (207)
Accounts payable and accrued liabilities 78 58
Accrued compensation and related taxes 52 162
Contract liabilities (291) 1,858
Net cash used in operating activities (2,525) (508)
Cash flows from investing activities:    
Acquisition of fixed assets (18)  
Disbursements for patents and other intangible assets (99) (56)
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   3,897
Net cash provided by (used in) investing activities (117) 1,684
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 12,967  
Taxes paid related to vesting of restricted stock units (31) (15)
Net cash provided by (used in) financing activities 12,936 (15)
Effect of exchange rate changes on cash and cash equivalents (4) (12)
Net change in cash and cash equivalents 10,290 1,149
Cash and cash equivalents, beginning of period 5,684 6,451
Cash and cash equivalents, end of period 15,974 7,600
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation 326 234
Prior year prepaid expenses repurposed to fixed assets as demonstration equipment   209
Non-cash impact of new lease $ 32 $ 34