Significant accounting policies - Additional information (Details)	12 Months Ended
Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Significant accounting policies
Number of reportable segments \| segment	1
Bad debt expense \| $	$ 0	$ 0

The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_ImpairmentLossRecognisedInProfitOrLossTradeReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration