Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Narrative)

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Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]    
Changes in valuation allowance $ 5,300 $ 7,500
Unrecognized tax benefits 0 $ 0
California Franchise Tax Board [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 116,600  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 157,200  
Operating loss carry forwards expiration year 2037  
Operating loss carry forwards not subject to expiration $ 57,500  
Operating loss carryforwards, limitations on use percentage 80.00%  
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 5,900  
Operating loss carry forwards expiration year 2043  
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforward, amount $ 9,200