Quarterly report pursuant to Section 13 or 15(d)

Organization and Business - Liquidity (Details)

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Organization and Business - Liquidity (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2024
CAD ($)
Offsetting Assets [Line Items]          
Cash $ 2,763,000 $ 2,763,000   $ 4,095,000  
Net decrease in cash, cash equivalents and restricted cash   1,332,000 $ 2,667,000    
Net cash used in financing activities   7,891,000 12,157,000    
Net cash provided by (used in) operating activities   3,845,000 (5,165,000)    
Net cash used in investing activities   2,560,000 14,648,000    
Proceeds from debt   7,500,000      
Principal payments on finance lease obligations   362,000 535,000    
Proceeds from sale and maturity of marketable securities   2,562,000 14,257,000    
Collection of production tax credits   8,300,000      
Depreciation and amortization   1,200,000      
Net losses   7,064,000 23,859,000    
Marketable securities, fair value 9,382,000 9,382,000   11,950,000  
Available for sale, decrease during period   2,600,000      
Margin loan balance 2,940,000 2,940,000   782,000  
Proceeds from lines of credit   2,828,000 3,771,000    
Repayments of lines of credit   9,654,000 5,966,000    
Accumulated deficit 725,591,000 725,591,000   718,546,000  
Stockholders' equity 46,500,000 46,500,000      
Current assets 41,011,000 41,011,000   57,109,000  
Marketable securities 9,382,000 9,382,000   11,950,000  
Current liabilities 34,885,000 34,885,000   45,640,000  
Working capital 6,100,000 6,100,000   11,500,000  
Equipment Lease Line          
Offsetting Assets [Line Items]          
Line of credit 1,000,000 1,000,000     $ 1,400,000
Revolving Demand Facility          
Offsetting Assets [Line Items]          
Line of credit facility, maximum borrowing capacity         1,000,000
Letter of Credit          
Offsetting Assets [Line Items]          
Line of credit facility, maximum borrowing capacity $ 200,000 200,000      
Debt instrument, term 1 year        
Treasury Risk Management Facility          
Offsetting Assets [Line Items]          
Line of credit         0
Line of credit facility, maximum borrowing capacity         $ 500,000
Prime Rate | Revolving Demand Facility          
Offsetting Assets [Line Items]          
Debt instrument, basis spread on variable rate 2.00%        
Margin Loan          
Offsetting Assets [Line Items]          
Margin loan balance $ 2,900,000 2,900,000   $ 800,000  
Proceeds from lines of credit   3,100,000      
Repayments of lines of credit   $ 900,000      
Debt, weighted average interest rate 0.95% 0.95%   0.98% 0.95%
Interest expense, debt   $ 18,632 $ 700,000    
Margin Loan | Median          
Offsetting Assets [Line Items]          
Proceeds from lines of credit   $ 14,200,000   $ 27,400,000  
Margin Loan | Federal Funds Rate          
Offsetting Assets [Line Items]          
Debt instrument, basis spread on variable rate   0.60%