Annual report pursuant to Section 13 and 15(d)

Organization and Business - Liquidity Narrative (Details)

v3.24.1.u1
Organization and Business - Liquidity Narrative (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 08, 2024
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
violation
Dec. 31, 2022
USD ($)
Apr. 08, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
violation
Mar. 17, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Offsetting Assets [Line Items]                      
Cash           $ 4,095,000 $ 7,432,000        
Net decrease in cash, cash equivalents and restricted cash           3,337,000 2,628,000        
Net cash used in financing activities           60,802,000 (54,444,000)        
Net cash used in operating activities           16,092,000 25,923,000        
Net cash used in investing activities           73,858,000 (30,937,000)        
Proceeds from debt           63,600,000          
Principal payments on finance lease obligations           2,162,000 1,310,000        
Proceeds from warrant exchange           5,299,000 0        
Proceeds from sale and maturity of marketable securities           72,137,000 14,112,000        
Marketable investments           11,950,000 83,706,000        
Available for sale, decrease during period           71,800,000          
Margin loan balance           782,000 60,810,000        
Proceeds from lines of credit           12,932,000 11,359,000        
Repayments of lines of credit           17,667,000 9,383,000        
Line of credit           $ 4,200,000     $ 5,500,000    
Debt instrument, covenant compliance, number of violations | violation           2     2    
Net losses   $ 12,441,000 $ 23,859,000 $ 36,300,000 $ 51,812,000 $ 77,202,000 44,529,000        
Accumulated deficit   $ 677,696,000 $ 665,271,000 $ 677,696,000 $ 693,172,000 718,546,000 641,443,000        
Stockholders' equity           53,300,000          
Current assets           57,109,000 139,525,000        
Marketable securities           11,950,000 83,706,000        
Current liabilities           45,640,000 110,908,000        
Working capital           11,500,000 28,600,000        
Equipment Lease Line                      
Offsetting Assets [Line Items]                      
Line of credit           1,200,000 2,400,000   $ 1,600,000   $ 3,300,000
Line of credit facility, maximum borrowing capacity                   $ 4,000,000  
Treasury Risk Management Facility                      
Offsetting Assets [Line Items]                      
Line of credit                 0   $ 0
Line of credit facility, maximum borrowing capacity                 $ 500,000    
Margin Loan                      
Offsetting Assets [Line Items]                      
Margin loan balance           800,000 $ 60,800,000        
Proceeds from lines of credit           21,200,000          
Repayments of lines of credit           $ 81,200,000          
Debt, weighted average interest rate           0.98% 1.66%   0.98%   1.66%
Interest expense, debt           $ 1,500,000 $ 1,300,000        
Margin Loan | Median                      
Offsetting Assets [Line Items]                      
Proceeds from lines of credit           $ 27,400,000 $ 27,100,000        
Margin Loan | Federal Funds Rate                      
Offsetting Assets [Line Items]                      
Debt instrument, basis spread on variable rate           0.60%          
Subsequent Event | Revolving Demand Facility                      
Offsetting Assets [Line Items]                      
Line of credit facility, maximum borrowing capacity               $ 1,000,000      
Subsequent Event | Letter of Credit                      
Offsetting Assets [Line Items]                      
Line of credit facility, maximum borrowing capacity $ 200,000                    
Debt instrument, term 1 year                    
Subsequent Event | Equipment Lease Line                      
Offsetting Assets [Line Items]                      
Line of credit facility, maximum borrowing capacity               1,600,000      
Subsequent Event | Treasury Risk Management Facility                      
Offsetting Assets [Line Items]                      
Line of credit               $ 0      
Subsequent Event | Prime Rate | Revolving Demand Facility                      
Offsetting Assets [Line Items]                      
Debt instrument, basis spread on variable rate 2.00%                    
Subsequent Event | Margin Loan                      
Offsetting Assets [Line Items]                      
Proceeds from lines of credit $ 4,700,000