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Shareholders' equity - Restricted stock unit (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) EquityInstruments shares | Dec. 31, 2018 USD ($) EquityInstruments
Restricted Share Units |  |
Stock-based payments |  |
Number of shares for each RSU vests | shares | 1 |
Fair value of RSUs granted | $ 3,900,000 | $ 3,400,000
Number of trading days immediately preceding the date of conversion or award grant for determining fair value | 5 days |
Stock-based compensation expenses | $ 2,600,000 | 2,600,000
Capitalised to royalty, stream and working interest | 600,000 | 500,000
Total unrecognized non-cash stock-based compensation expense | $ 6,400,000 | $ 5,400,000
Expected to be recognized over weighted average period | 2 years 1 month 6 days | 2 years 1 month 6 days
Performance based RSU |  |
Stock-based payments |  |
Vesting period | 3 years |
Granted | EquityInstruments | 20,153 | 24,724
Performance based RSU | Bottom |  |
Stock-based payments |  |
Target settlement range 0% to 100% | 0.00% |
Performance based RSU | Top |  |
Stock-based payments |  |
Target settlement range 0% to 100% | 100.00% |
Time-based RSU |  |
Stock-based payments |  |
Vesting period | 3 years |
Granted | 19,863 | 24,341

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- Definition The amount of unrecognized expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References No definition available. + Details
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- Definition The number of trading days immediately preceding the date of conversion or award grant for determining fair value. + References No definition available. + Details
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