Non-controlling interests - Summary of Changes in the Balances Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Beginning Balance	$ 4,981	$ 9,373	$ 15,213	$ 9,373	$ 9,444
Distributions	(6,832)		(12,233)	(7,748)	(12,737)
Share-based compensation expense			1,615		1,615
Net income (loss)	(2,561)		(10,699)	(4,099)	(10,699)
Ending Balance	4,443	4,981	$ 4,780	4,443	$ 4,780
BT HoldCo
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Beginning Balance	18,879	22,480		22,480
Distributions	(6,832)	(916)
Foreign currency translation	4	9
Redemption of non-controlling interest	(585)
Net income (loss)	6,871	(2,694)
Ending Balance	18,337	18,879		18,337
Total
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Beginning Balance	21,598	25,187		25,187
Distributions	(6,832)	(916)
Share-based compensation expense	8	8
Foreign currency translation	4	9
Redemption of non-controlling interest	(585)
Net income (loss)	6,911	(2,690)
Ending Balance	21,104	21,598		21,104
Bit Access [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Beginning Balance	2,719	2,707		2,707
Share-based compensation expense	8	8
Net income (loss)	40	4
Ending Balance	$ 2,767	$ 2,719		$ 2,767