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Long-term investments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Investments [Line Items]        
Revenue $ 1,617 $ 4,877 $ 21,438 $ 33,414
Gross profit 472 663 2,849 2,480
Operating expenses:        
Research and development 2,319 628 5,186 8,437
General and administrative 4,130 3,416 10,908 16,331
Sales and marketing 305 367 1,038 2,450
Foreign exchange gain 1,282 (1,709) (4,145) 86
Depreciation and amortization 146 103 360 559
Operating expenses 8,182 2,805 13,347 27,863
Loss from continuing operations (7,710) (2,142) (10,498) (25,383)
Interest income (expense), net of bank charges 653 215 1,155 235
Loss before income taxes (10,396) (5,538) (20,610) (17,197)
Income tax (recovery) expense 14 430 148 646
Net loss for the period (13,726) (3,868) (50,521) (11,699)
Cespira Joint Venture        
Schedule of Investments [Line Items]        
Revenue 19,328 16,209 48,147 20,268
Cost of revenue 20,364 16,374 50,594 20,275
Gross profit (1,036) (165) (2,447) (7)
Operating expenses:        
Research and development 1,135 1,830 6,025 2,951
General and administrative 2,410 1,943 7,829 2,658
Sales and marketing 357 335 975 404
Foreign exchange gain 147 127 59 279
Depreciation and amortization 833 944 2,423 1,209
Operating expenses 4,882 5,179 17,311 7,501
Loss from continuing operations (5,918) (5,344) (19,758) (7,508)
Interest income (expense), net of bank charges (71) 117 (39) 117
Loss before income taxes (5,989) (5,227) (19,797) (7,391)
Income tax (recovery) expense 45 11 (19) 15
Net loss for the period $ (6,034) $ (5,238) $ (19,778) $ (7,406)