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Share-based compensation (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021 shares	May 14, 2014 shares	Mar. 31, 2012 shares
Equity Incentive Plan 2012
Share-Based Compensation [Line Items]
Equity awards available for grants (in shares)			8,064,081
Equity Incentive Plan 2014
Share-Based Compensation [Line Items]
Equity awards available for grants (in shares)	8,500,000	4,500,000
NV Equity Plan
Share-Based Compensation [Line Items]
Restricted stock units convertible to common shares, conversion ratio	1
NV Equity Plan | Minimum
Share-Based Compensation [Line Items]
Equity award vesting period	3 years
NV Equity Plan | Maximum
Share-Based Compensation [Line Items]
Equity award vesting period	5 years

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Restricted Stock Units, Convertible, Conversion Ratio

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ 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
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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