Revenue and segment reporting - Geographic location (Details) $ in Thousands	12 Months Ended
Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment reporting
Number of operating segments \| segment	2
Revenue	$ 66,089	$ 7,475	$ 2,734
Asia
Segment reporting
Revenue	20,848	1,562	988
North America
Segment reporting
Revenue	20,915	3,946	1,338
Africa
Segment reporting
Revenue	24,212	1,848	303
Europe
Segment reporting
Revenue	13	87	98
Others
Segment reporting
Revenue	$ 101	$ 32	$ 7

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. References

No definition available.

Name:	ambr_IfrsNumberOfOperatingSegments
Namespace Prefix:	ambr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration