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Shareholders' equity - Restricted stock unit (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) EquityInstruments shares | Dec. 31, 2017 USD ($) EquityInstruments
Bottom |  |
Stock-based payments |  |
Target settlement range 0% to 100% | 0.00% |
Top |  |
Stock-based payments |  |
Target settlement range 0% to 100% | 100.00% |
Restricted Share Units |  |
Stock-based payments |  |
Number of shares for each RSU vests | shares | 1 |
Fair value of RSUs granted | $ 3.4 | $ 3.3
Number of trading days immediately preceding the date of conversion or award grant for determining fair value | 5 days |
Stock-based compensation expenses | $ 2.6 | 1.5
Capitalised to royalty, stream and working interest | 0.5 | 0.3
Total unrecognized non-cash stock-based compensation expense | $ 5.4 | $ 5.3
Expected to be recognized over weighted average period | 2 years 1 month 6 days | 1 year 6 months
Performance based RSU |  |
Stock-based payments |  |
Vesting period | 3 years |
Granted | EquityInstruments | 24,724 | 21,095
Time-based RSU |  |
Stock-based payments |  |
Vesting period | 3 years |
Granted | EquityInstruments | 24,341 | 20,745

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