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Share based compensation - Share Options Issued (Details) - Share options - $ / shares	1 Months Ended		12 Months Ended
	Aug. 31, 2021	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation (in shares)	5,150,000	230,000
Exercise price (in dollars per share)	$ 2.00	$ 35.00	$ 2.00	$ 0	$ 35.00
Share price (in dollars per share)	$ 1.40	$ 28.40

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of shares issued under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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