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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating activities:    
Net loss $ (16,328) $ (13,745)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,174 1,559
Accrual for contingent settlement liability 1,500  
Other expenses settled with stock issuances 50 130
Loss from change in fair value of common stock make-whole obligation 45 44
Depreciation and amortization 430 412
Change in fair value of warrant liability   (3,089)
Changes in non-cash working capital balances:    
Account receivable 365 (365)
Prepaid expenses and other current assets 39 270
Accounts payable (1,289) 1,799
Accrued liabilities 46 (565)
Operating lease assets and liabilities, net   7
Cash used in operating activities (13,968) (13,543)
Investing activities:    
Purchases of equipment (84) (65)
Cash used in investing activities (84) (65)
Financing activities:    
Proceeds from issuances of Common Stock, net 5,191 15,331
Repurchases of Common Stock (200)  
Proceeds from warrant exercise   1,250
Cash provided by financing activities 16,121 16,728
Increase in cash and cash equivalents during the year 2,069 3,120
Cash and cash equivalents, beginning of the year 13,589 10,469
Cash and cash equivalents, end of the year 15,658 13,589
Non-cash investing and financing activities:    
Series D Preferred Stock dividends settled through issuance of Common Stock 151  
Issuance costs related to Common Stock Purchase Agreement settled through issuance of Common Stock   248
Cashless exercise of warrant   926
Series C Preferred Stock    
Financing activities:    
Proceeds from issuances of Preferred Stock, net   $ 147
Series D Preferred Stock    
Financing activities:    
Proceeds from issuances of Preferred Stock, net $ 11,130