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Share-based Payments - Summary of Principal Assumptions used for Valuation of Share Options (Details) | 12 Months Ended
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Dec. 31, 2017 GBP (£) shares yr | Dec. 31, 2016 GBP (£) shares yr | Dec. 31, 2015 shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Number of options granted | shares | 1,500,815 | 507,690 | 0
2016 Share Options | Grant Date Jun 30, 2016 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 69.05% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.11% |
Fair value of option at grant date |  | £ 4.02 |
Fair value of share at grant date |  | 6.97 |
Exercise price at date of grant |  | £ 4.00 |
Lapse date |  | Jun. 30, 2026 |
Expected option life (years) | yr |  | 2.50 |
Number of options granted | shares |  | 270,690 |
2016 Share Options | Grant Date Aug 22, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 6.15 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 2.80 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 12,500 |
2016 Share Options | Grant Date Aug 22, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 6.01 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 3.00 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 37,500 |
2016 Share Options | Grant Date Aug 22, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 5.74 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 3.40 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 25,000 |
2016 Share Options | Grant Date Aug 22, 2016 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 5.62 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 3.60 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 11,250 |
2016 Share Options | Grant Date Aug 22, 2016 Five |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 5.62 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 3.60 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 5,000 |
2016 Share Options | Grant Date Aug 22, 2016 Six |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 67.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.07% |
Fair value of option at grant date |  | £ 5.62 |
Fair value of share at grant date |  | 8.61 |
Exercise price at date of grant |  | £ 3.60 |
Lapse date |  | Aug. 22, 2026 |
Expected option life (years) | yr |  | 2.36 |
Number of options granted | shares |  | 37,500 |
2016 Share Options | Grant Date Oct 28, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 68.38% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.28% |
Fair value of option at grant date |  | £ 5.85 |
Fair value of share at grant date |  | 8.76 |
Exercise price at date of grant |  | £ 3.40 |
Lapse date |  | Oct. 28, 2026 |
Expected option life (years) | yr |  | 2.17 |
Number of options granted | shares |  | 12,500 |
2016 Share Options | Grant Date Oct 28, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 68.38% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.28% |
Fair value of option at grant date |  | £ 5.46 |
Fair value of share at grant date |  | 8.76 |
Exercise price at date of grant |  | £ 4.00 |
Lapse date |  | Oct. 28, 2026 |
Expected option life (years) | yr |  | 2.17 |
Number of options granted | shares |  | 50,000 |
2016 Share Options | Grant Date Oct 28, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 60.92% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.06% |
Fair value of option at grant date |  | £ 5.22 |
Fair value of share at grant date |  | 9.19 |
Exercise price at date of grant |  | £ 4.00 |
Lapse date |  | Dec. 12, 2026 |
Expected option life (years) | yr |  | 0.50 |
Number of options granted | shares |  | 45,750 |
2016 Share Options | Vesting Dates One | Grant Date Jun 30, 2016 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 12, 2016 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Aug. 22, 2016 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Aug. 22, 2016 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 07, 2016 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 01, 2017 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 Five |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 01, 2017 |
2016 Share Options | Vesting Dates One | Grant Date Aug 22, 2016 Six |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 16, 2017 |
2016 Share Options | Vesting Dates One | Grant Date Oct 28, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2017 |
2016 Share Options | Vesting Dates One | Grant Date Oct 28, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2016 |
2016 Share Options | Vesting Dates One | Grant Date Oct 28, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 12, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Jun 30, 2016 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 12, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Aug. 22, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Aug. 22, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 07, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 01, 2018 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 Five |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 01, 2018 |
2016 Share Options | Vesting Dates Two | Grant Date Aug 22, 2016 Six |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 16, 2018 |
2016 Share Options | Vesting Dates Two | Grant Date Oct 28, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2018 |
2016 Share Options | Vesting Dates Two | Grant Date Oct 28, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2017 |
2016 Share Options | Vesting Dates Two | Grant Date Oct 28, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 12, 2018 |
2016 Share Options | Vesting Dates Three | Grant Date Jun 30, 2016 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 12, 2018 |
2016 Share Options | Vesting Dates Three | Grant Date Aug 22, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 07, 2018 |
2016 Share Options | Vesting Dates Three | Grant Date Aug 22, 2016 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 01, 2019 |
2016 Share Options | Vesting Dates Three | Grant Date Aug 22, 2016 Five |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 01, 2019 |
2016 Share Options | Vesting Dates Three | Grant Date Aug 22, 2016 Six |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 16, 2019 |
2016 Share Options | Vesting Dates Three | Grant Date Oct 28, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2019 |
2016 Share Options | Vesting Dates Three | Grant Date Oct 28, 2016 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2018 |
2016 Share Options | Vesting Dates Three | Grant Date Oct 28, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 12, 2019 |
2016 Share Options | Vesting Dates Four | Grant Date Jun 30, 2016 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 12, 2019 |
2016 Share Options | Vesting Dates Four | Grant Date Aug 22, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 07, 2019 |
2016 Share Options | Vesting Dates Four | Grant Date Aug 22, 2016 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 01, 2020 |
2016 Share Options | Vesting Dates Four | Grant Date Aug 22, 2016 Five |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 01, 2020 |
2016 Share Options | Vesting Dates Four | Grant Date Aug 22, 2016 Six |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 16, 2020 |
2016 Share Options | Vesting Dates Four | Grant Date Oct 28, 2016 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Oct. 28, 2020 |
2016 Share Options | Vesting Dates Four | Grant Date Oct 28, 2016 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Dec. 12, 2020 |
2017 Share Options | Grant Date May 16, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.56% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.12% |  |
Fair value of option at grant date | £ 7.70 |  |
Fair value of share at grant date | 11.08 |  |
Exercise price at date of grant | £ 4.00 |  |
Lapse date | May 16, 2027 |  |
Expected option life (years) | yr | 2.63 |  |
Number of options granted | shares | 23,250 |  |
2017 Share Options | Grant Date Sep 13, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.94% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.27% |  |
Fair value of option at grant date | £ 6.15 |  |
Fair value of share at grant date | 10.43 |  |
Exercise price at date of grant | £ 5.40 |  |
Lapse date | Sep. 13, 2027 |  |
Expected option life (years) | yr | 2.30 |  |
Number of options granted | shares | 14,690 |  |
2017 Share Options | Grant Date Sep 14, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.97% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.36% |  |
Fair value of option at grant date | £ 6.08 |  |
Fair value of share at grant date | 10.34 |  |
Exercise price at date of grant | £ 5.40 |  |
Lapse date | Sep. 14, 2027 |  |
Expected option life (years) | yr | 2.30 |  |
Number of options granted | shares | 25,000 |  |
2017 Share Options | Grant Date Sep 14, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.97% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.36% |  |
Fair value of option at grant date | £ 6.08 |  |
Fair value of share at grant date | 10.34 |  |
Exercise price at date of grant | £ 5.40 |  |
Lapse date | Sep. 14, 2027 |  |
Expected option life (years) | yr | 2.30 |  |
Number of options granted | shares | 110,310 |  |
2017 Share Options | Grant Date Sep 14, 2017 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.97% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.36% |  |
Fair value of option at grant date | £ 6.08 |  |
Fair value of share at grant date | 10.34 |  |
Exercise price at date of grant | £ 5.40 |  |
Lapse date | Sep. 14, 2027 |  |
Expected option life (years) | yr | 2.30 |  |
Number of options granted | shares | 12,500 |  |
2017 Share Options | Grant Date Sep 14, 2017 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 66.97% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.36% |  |
Fair value of option at grant date | £ 3.90 |  |
Fair value of share at grant date | 10.34 |  |
Exercise price at date of grant | £ 10.80 |  |
Lapse date | Sep. 14, 2027 |  |
Expected option life (years) | yr | 2.30 |  |
Number of options granted | shares | 25,000 |  |
2017 Share Options | Grant Date Sep 15, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 67.02% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.44% |  |
Fair value of option at grant date | £ 6.76 |  |
Fair value of share at grant date | 10.15 |  |
Exercise price at date of grant | £ 4.00 |  |
Lapse date | Sep. 15, 2027 |  |
Expected option life (years) | yr | 2.29 |  |
Number of options granted | shares | 45,750 |  |
2017 Share Options | Grant Date Sep 15, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 67.02% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.44% |  |
Fair value of option at grant date | £ 10.11 |  |
Fair value of share at grant date | 10.15 |  |
Exercise price at date of grant | £ 0.04 |  |
Lapse date | Sep. 15, 2027 |  |
Expected option life (years) | yr | 2.29 |  |
Number of options granted | shares | 1,028,533 |  |
2017 Share Options | Grant Date Sep 27, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 67.11% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.47% |  |
Fair value of option at grant date | £ 4.36 |  |
Fair value of share at grant date | 11.19 |  |
Exercise price at date of grant | £ 11.19 |  |
Lapse date | Sep. 27, 2027 |  |
Expected option life (years) | yr | 2.26 |  |
Number of options granted | shares | 37,500 |  |
2017 Share Options | Grant Date Sep 27, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 67.11% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.47% |  |
Fair value of option at grant date | £ 4.36 |  |
Fair value of share at grant date | 11.19 |  |
Exercise price at date of grant | £ 11.19 |  |
Lapse date | Sep. 27, 2027 |  |
Expected option life (years) | yr | 2.26 |  |
Number of options granted | shares | 178,282 |  |
2017 Share Options | Vesting Dates One | Grant Date May 16, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Oct. 28, 2017 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 13, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 13, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 14, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 06, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 14, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 14, 2017 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 14, 2017 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 15, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 15, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 15, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 15, 2017 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 27, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 20, 2018 |  |
2017 Share Options | Vesting Dates One | Grant Date Sep 27, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 27, 2018 |  |
2017 Share Options | Vesting Dates Two | Grant Date May 16, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Oct. 28, 2018 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 13, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 13, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 14, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 06, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 14, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 14, 2017 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 14, 2017 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 15, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 15, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 27, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 20, 2019 |  |
2017 Share Options | Vesting Dates Two | Grant Date Sep 27, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 27, 2019 |  |
2017 Share Options | Vesting Dates Three | Grant Date May 16, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Oct. 28, 2019 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 13, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 13, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 14, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 06, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 14, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 14, 2017 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 14, 2017 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 15, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 15, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 27, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 20, 2020 |  |
2017 Share Options | Vesting Dates Three | Grant Date Sep 27, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 27, 2020 |  |
2017 Share Options | Vesting Dates Four | Grant Date May 16, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Oct. 28, 2020 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 13, 2017 |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 13, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 14, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 06, 2012 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 14, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 14, 2017 Three |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 14, 2017 Four |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 14, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 15, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 15, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 27, 2017 One |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Mar. 20, 2021 |  |
2017 Share Options | Vesting Dates Four | Grant Date Sep 27, 2017 Two |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 27, 2021 |  |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Description of lapse date of share options granted. + References No definition available. + Details
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- Definition Description of vesting date of share options granted. + References No definition available. + Details
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