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Non-controlling interests - Summary of Changes in the Balances Non-controlling Interests (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Beginning Balance $ 4,693 $ (4,592) $ (16,486) $ 4,443 $ 4,981 $ 9,373 $ (16,486) $ 9,373
Distributions   (7,640) (2,477) (15,000) (6,832) (916)    
Net income (loss) 5,544     (939)     15,807 (5,038)
Ending Balance 21,016 4,693 (4,592) (7,865) 4,443 4,981 21,016 (7,865)
BT HoldCo                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Beginning Balance   9,937 4,472 18,337 18,879 22,480 4,472 22,480
Distributions   (7,640) (2,477) (15,000) (6,832) (916)    
Distribution related to Up-C Restructuring   (8,595)            
Foreign currency translation   (59) (89) (13) 4 9    
Redemption of non-controlling interest         (585)      
Net income (loss)   6,357 8,031 3,366 6,871 (2,694)    
Ending Balance     9,937 6,690 18,337 18,879   6,690
Total                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Beginning Balance 2,537 12,570 7,146 21,104 21,598 25,187 7,146 25,187
Distributions   (7,640) (2,477) (15,000) (6,832) (916)    
Share-based compensation expense 8 8 8   8 8    
Distribution related to Up-C Restructuring   (8,595)            
Foreign currency translation (6) (59) (89) (5) 4 9    
Redemption of non-controlling interest         (585)      
Net income (loss) (57) 6,253 7,982 3,238 6,911 (2,690)    
Ending Balance 2,482 2,537 12,570 9,337 21,104 21,598 2,482 9,337
Bit Access [Member]                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Beginning Balance 2,537 2,633 2,674 2,767 2,719 2,707 2,674 2,707
Share-based compensation expense 8 8 8   8 8    
Foreign currency translation (6)     8        
Net income (loss) (57) (104) (49) (128) 40 4    
Ending Balance $ 2,482 $ 2,537 $ 2,633 $ 2,647 $ 2,767 $ 2,719 $ 2,482 $ 2,647