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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (4,239) $ (4,440)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 7 21
Share-based compensation 419 307
Depreciation and amortization 231 113
Gain from sale of fixed assets (5) (37)
Right of use asset amortization 105 116
Realized gain from marketable securities (79)  
Lease Amendments (14)  
Impairment of intangible assets 14  
Change in operating assets and liabilities:    
Contract assets 13 (245)
Accounts receivable (8) (5)
Prepaid expenses and other assets (116) (161)
Accounts payable and accrued liabilities 6 (99)
Accrued compensation and related taxes 329 189
Contract liabilities 1,554 (23)
Net cash used in operating activities (1,783) (4,264)
Cash flows from investing activities:    
Acquisition of fixed assets   (5)
Disbursements for patents and other intangible assets (95) (114)
Proceeds from sale of fixed assets 5 37
Purchases of held-to-maturity short-term US treasuries (2,162) (3,900)
Redemption of held-to-maturity US treasuries 4,847  
Net cash provided by (used in) investing activities 2,595 (3,982)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs   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 (13) (20)
Net change in cash and cash equivalents 784 (1,727)
Cash and cash equivalents, beginning of period 6,451 7,607
Cash and cash equivalents, end of period 7,235 5,880
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