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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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- Definition 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 + Details
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