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Commitments and contingencies (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Commitments and contingencies
Provision for contingent losses	$ 0

X

- References

No definition available.

+ Details

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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