Guarantees, commitments and risks - Sensitivity USD (Details) - Strategic liquidity risk - USD - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Guarantees, commitments and risks
Value at risk	$ 50	$ 20
Minimum
Guarantees, commitments and risks
Value at risk	20	10
Maximum
Guarantees, commitments and risks
Value at risk	50	40
Average
Guarantees, commitments and risks
Value at risk	$ 40	$ 20

The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 41
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_41&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_ValueAtRisk
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant