Quarterly report pursuant to Section 13 or 15(d)

Organization and Business - Liquidity (Details)

v3.24.2.u1
Organization and Business - Liquidity (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
violation
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
violation
Jun. 30, 2023
USD ($)
Jun. 30, 2024
CAD ($)
violation
Mar. 31, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Offsetting Assets [Line Items]                
Cash   $ 2,741,000   $ 2,741,000       $ 4,095,000
Net decrease in cash, cash equivalents and restricted cash       1,354,000 $ 2,593,000      
Net cash used in financing activities       4,804,000 27,941,000      
Net cash used in operating activities       2,654,000 10,587,000      
Net provided by investing activities       5,518,000 35,948,000      
Proceeds from debt       7,700,000        
Proceeds from securities purchase agreement       3,329,000 0      
Proceeds from sale and maturity of marketable securities       5,514,000 34,169,000      
Marketable securities, fair value   6,455,000   6,455,000       11,950,000
Marketable securities, decrease during period       5,500,000        
Margin loan balance   $ 1,056,000   1,056,000       782,000
Proceeds from lines of credit       4,285,000 6,866,000      
Repayments of lines of credit       $ 9,653,000 8,315,000      
Debt instrument, covenant compliance, number of violations | violation   2   2   2    
Net losses   $ 5,923,000 $ 12,441,000 $ 12,987,000 36,300,000      
Accumulated deficit   731,464,000   731,464,000       718,546,000
Stockholders' equity   44,400,000   44,400,000        
Current assets   38,822,000   38,822,000       57,109,000
Marketable securities   6,455,000   6,455,000       11,950,000
Current liabilities   33,589,000   33,589,000       45,640,000
Working capital   5,200,000   5,200,000       11,500,000
Revolving Demand Facility and Equipment Lease Agreements                
Offsetting Assets [Line Items]                
Line of credit   1,300,000   1,300,000   $ 1,700,000    
Revolving Demand Facility                
Offsetting Assets [Line Items]                
Debt instrument, basis spread on variable rate 2.00%              
Line of credit facility, maximum borrowing capacity             $ 1,000,000  
Letter of Credit                
Offsetting Assets [Line Items]                
Debt instrument, basis spread on variable rate 2.00%              
Line of credit facility, maximum borrowing capacity $ 200,000              
Debt instrument, term 1 year              
Treasury Risk Management Facility                
Offsetting Assets [Line Items]                
Line of credit           0 0  
Line of credit facility, maximum borrowing capacity             $ 500,000  
Equipment Lease Line                
Offsetting Assets [Line Items]                
Line of credit   900,000   900,000   $ 1,200,000    
Margin Loan                
Offsetting Assets [Line Items]                
Margin loan balance   $ 1,100,000   1,100,000       $ 800,000
Proceeds from lines of credit       6,300,000        
Repayments of lines of credit       $ 6,000,000        
Debt instrument, basis spread on variable rate       0.60%        
Debt, weighted average interest rate   0.82%   0.82%   0.82%   0.98%
Interest expense, debt   $ 12,429 $ 600,000 $ 31,061 $ 1,300,000      
Margin Loan | Median                
Offsetting Assets [Line Items]                
Margin loan balance   $ 9,800,000   $ 9,800,000       $ 27,400,000