Fixed assets - Internally developed software and acquired software (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Internally developed software
Property, Plant and Equipment [Line Items]
Software additions	$ 23,846	$ 13,082
Accumulated amortization	(5,528)	(1,888)
Software additions, net	18,318	11,194
Acquired software
Property, Plant and Equipment [Line Items]
Software additions	2	1,470
Accumulated amortization	(63)	(17)
Software additions, net	$ (61)	$ 1,453

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration