Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Narrative)

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Organization and Summary of Significant Accounting Policies (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 05, 2024
Mar. 31, 2024
Mar. 26, 2024
Feb. 02, 2024
Dec. 14, 2023
Oct. 12, 2023
Feb. 10, 2023
Feb. 25, 2021
Feb. 25, 2021
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Net loss                   $ 886 $ 293  
Cash in operating activities                   2,733 $ 4,871  
Accumulated deficit   $ 271,600               $ 271,600   $ 270,714
Common Stock, Shares, Issued   51,080,138               51,080,138   5,320,671
Stock issued in public offering, units 71,600,000   28,400,000 16,000,000     2,150,000          
Gross proceeds from sale of stock                   $ 1,030,519,000    
Sale of stock price $ 0.021   $ 0.047 $ 0.25                
Warrants exercise price       $ 0.275     $ 5.60          
Offering expenses payable $ 1,500   $ 1,300 $ 4,000                
State and local income tax percentage         5.00%              
Class E And Class F Warrants [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Warrants exercise price       $ 0.25                
Common Stock Warrants [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Stock issued in public offering, units             86,000          
Gross proceeds from sale of stock       $ 4,000     $ 12,000          
Common Stock and Prefunded Warrants [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Gross proceeds from sale of stock       600     5,400          
Offering costs       500     4,800          
Offering fees and expenses       4,000                
Derivative Liabilities for Common Stock Warrants [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Gross proceeds from sale of stock       3,400     6,700          
Offering costs       500     700          
Agent Warrant Offering [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Offering costs       $ 100     $ 100          
2021 Equity Distribution Agreement [Member] | Maxim Group LLC [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Aggregate offering price           $ 15,000   $ 15,000        
Distribution amount                 $ 1,100      
Available for sale   $ 70                    
Distribution Agreement [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Common Stock, Shares, Issued   2,471,949               2,471,949 2,471,949  
Gross proceeds from sale of stock                   $ 70,000,000