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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, 2020 GBP (£) shares yr £ / shares | Dec. 31, 2019 GBP (£) shares yr £ / shares | Dec. 31, 2018 GBP (£) shares yr £ / shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Number of options granted | shares | 2,665,639 | 1,202,150 | 253,500
2018 Share Options [member] | Grant Date April 11, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  |  | 64.48%
Dividend yield |  |  | 0.00%
Risk-free investment rate |  |  | 1.04%
Fair value of option at grant date | £ |  |  | £ 8.97
Fair value of share at grant date |  |  | £ 17.51
Exercise price at date of grant |  |  | £ 17.51
Lapse date |  |  | Apr. 11, 2028
Expected option life (years) | yr |  |  | 4.50
Number of options granted | shares |  |  | 71,500
2018 Share Options [member] | Grant Date April 11, 2018 One [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  |  | 60.06%
Dividend yield |  |  | 0.00%
Risk-free investment rate |  |  | 0.83%
Fair value of option at grant date | £ |  |  | £ 17.35
Fair value of share at grant date |  |  | £ 17.51
Exercise price at date of grant |  |  | £ 0.16
Lapse date |  |  | Apr. 11, 2028
Expected option life (years) | yr |  |  | 2.00
Number of options granted | shares |  |  | 7,500
2018 Share Options [member] | Grant Date May 8, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  |  | 65.80%
Dividend yield |  |  | 0.00%
Risk-free investment rate |  |  | 1.02%
Fair value of option at grant date | £ |  |  | £ 8.63
Fair value of share at grant date |  |  | £ 16.57
Exercise price at date of grant |  |  | £ 16.57
Lapse date |  |  | May 08, 2028
Expected option life (years) | yr |  |  | 4.50
Number of options granted | shares |  |  | 62,000
2018 Share Options [member] | Grant Date Aug 14, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  |  | 68.14%
Dividend yield |  |  | 0.00%
Risk-free investment rate |  |  | 0.93%
Fair value of option at grant date | £ |  |  | £ 9.65
Fair value of share at grant date |  |  | £ 18.05
Exercise price at date of grant |  |  | £ 18.05
Lapse date |  |  | Aug. 14, 2028
Expected option life (years) | yr |  |  | 4.50
Number of options granted | shares |  |  | 112,500
2018 Share Options [member] | Vesting Dates One [member] | Grant Date April 11, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Apr. 11, 2019
2018 Share Options [member] | Vesting Dates One [member] | Grant Date April 11, 2018 One [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Apr. 11, 2018
2018 Share Options [member] | Vesting Dates One [member] | Grant Date May 8, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | May 08, 2019
2018 Share Options [member] | Vesting Dates One [member] | Grant Date Aug 14, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Aug. 14, 2019
2018 Share Options [member] | Vesting Dates Two [member] | Grant Date April 11, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Apr. 11, 2020
2018 Share Options [member] | Vesting Dates Two [member] | Grant Date May 8, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | May 08, 2020
2018 Share Options [member] | Vesting Dates Two [member] | Grant Date Aug 14, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Aug. 14, 2020
2018 Share Options [member] | Vesting Dates Three [member] | Grant Date April 11, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Apr. 11, 2021
2018 Share Options [member] | Vesting Dates Three [member] | Grant Date May 8, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | May 08, 2021
2018 Share Options [member] | Vesting Dates Three [member] | Grant Date Aug 14, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Aug. 14, 2021
2018 Share Options [member] | Vesting Dates Four [member] | Grant Date April 11, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Apr. 11, 2022
2018 Share Options [member] | Vesting Dates Four [member] | Grant Date May 8, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | May 08, 2022
2018 Share Options [member] | Vesting Dates Four [member] | Grant Date Aug 14, 2018 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  |  | Aug. 14, 2022
2019 Share Options [member] | Grant Date Mar 13, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 69.05% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.85% |
Fair value of option at grant date | £ |  | £ 5.46 |
Fair value of share at grant date |  | £ 10.13 |
Exercise price at date of grant |  | £ 10.13 |
Lapse date |  | Mar. 13, 2029 |
Expected option life (years) | yr |  | 4.50 |
Number of options granted | shares |  | 120,750 |
2019 Share Options [member] | Grant Date May 15, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 69.08% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.77% |
Fair value of option at grant date | £ |  | £ 6.07 |
Fair value of share at grant date |  | £ 11.26 |
Exercise price at date of grant |  | £ 11.26 |
Lapse date |  | May 15, 2029 |
Expected option life (years) | yr |  | 4.50 |
Number of options granted | shares |  | 967,400 |
2019 Share Options [member] | Grant Date Sept, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility |  | 70.14% |
Dividend yield |  | 0.00% |
Risk-free investment rate |  | 0.44% |
Fair value of option at grant date | £ |  | £ 4.22 |
Fair value of share at grant date |  | £ 7.79 |
Exercise price at date of grant |  | £ 7.79 |
Lapse date |  | Sep. 11, 2029 |
Expected option life (years) | yr |  | 4.50 |
Number of options granted | shares |  | 114,000 |
2019 Share Options [member] | Vesting Dates One [member] | Grant Date Mar 13, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 13, 2020 |
2019 Share Options [member] | Vesting Dates One [member] | Grant Date May 15, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 15, 2020 |
2019 Share Options [member] | Vesting Dates One [member] | Grant Date Sept, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Sep. 11, 2020 |
2019 Share Options [member] | Vesting Dates Two [member] | Grant Date Mar 13, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 13, 2021 |
2019 Share Options [member] | Vesting Dates Two [member] | Grant Date May 15, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 15, 2021 |
2019 Share Options [member] | Vesting Dates Two [member] | Grant Date Sept, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Sep. 11, 2021 |
2019 Share Options [member] | Vesting Dates Three [member] | Grant Date Mar 13, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 13, 2022 |
2019 Share Options [member] | Vesting Dates Three [member] | Grant Date May 15, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 15, 2022 |
2019 Share Options [member] | Vesting Dates Three [member] | Grant Date Sept, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Sep. 11, 2022 |
2019 Share Options [member] | Vesting Dates Four [member] | Grant Date Mar 13, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Mar. 13, 2023 |
2019 Share Options [member] | Vesting Dates Four [member] | Grant Date May 15, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | May 15, 2023 |
2019 Share Options [member] | Vesting Dates Four [member] | Grant Date Sept, 2019 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates |  | Sep. 11, 2023 |
2020 Share Options [member] | Grant Date June 10, 2020 [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 76.59% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | 0.003% |  |
Fair value of option at grant date | £ | £ 2.76 |  |
Fair value of share at grant date | £ 4.78 |  |
Exercise price at date of grant | £ 4.78 |  |
Lapse date | Jun. 10, 2030 |  |
Expected option life (years) | yr | 4.50 |  |
Number of options granted | shares | 2,186,780 |  |
2020 Share Options [member] | Grant Date September 9 2020 One [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 82.98% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | (0.08%) |  |
Fair value of option at grant date | £ | £ 4.24 |  |
Fair value of share at grant date | £ 4.28 |  |
Exercise price at date of grant | £ 0.04 |  |
Lapse date | Sep. 09, 2030 |  |
Expected option life (years) | yr | 3.50 |  |
Number of options granted | shares | 290,356 |  |
2020 Share Options [member] | Grant Date September 9 2020 Two [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 87.21% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | (0.08%) |  |
Fair value of option at grant date | £ | £ 4.24 |  |
Fair value of share at grant date | £ 4.28 |  |
Exercise price at date of grant | £ 0.04 |  |
Expected option life (years) | yr | 2.50 |  |
Number of options granted | shares | 108,503 |  |
2020 Share Options [member] | Grant Date December 9, 2020 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Volatility | 81.26% |  |
Dividend yield | 0.00% |  |
Risk-free investment rate | (0.03%) |  |
Fair value of option at grant date | £ | £ 2.10 |  |
Fair value of share at grant date | £ 3.48 |  |
Exercise price at date of grant | £ 3.48 |  |
Lapse date | Dec. 09, 2030 |  |
Expected option life (years) | yr | 4.50 |  |
Number of options granted | shares | 80,000 |  |
2020 Share Options [member] | Vesting Dates One [member] | Grant Date June 10, 2020 [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Jun. 10, 2021 |  |
2020 Share Options [member] | Vesting Dates One [member] | Grant Date September 9 2020 One [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2021 |  |
2020 Share Options [member] | Vesting Dates One [member] | Grant Date September 9 2020 Two [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2021 |  |
2020 Share Options [member] | Vesting Dates One [member] | Grant Date December 9, 2020 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Dec. 09, 2021 |  |
2020 Share Options [member] | Vesting Dates Two [member] | Grant Date June 10, 2020 [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Jun. 10, 2022 |  |
2020 Share Options [member] | Vesting Dates Two [member] | Grant Date September 9 2020 One [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2022 |  |
2020 Share Options [member] | Vesting Dates Two [member] | Grant Date September 9 2020 Two [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2022 |  |
2020 Share Options [member] | Vesting Dates Two [member] | Grant Date December 9, 2020 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Dec. 09, 2022 |  |
2020 Share Options [member] | Vesting Dates Three [member] | Grant Date June 10, 2020 [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Jun. 10, 2023 |  |
2020 Share Options [member] | Vesting Dates Three [member] | Grant Date September 9 2020 One [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2023 |  |
2020 Share Options [member] | Vesting Dates Three [member] | Grant Date September 9 2020 Two [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2023 |  |
2020 Share Options [member] | Vesting Dates Three [member] | Grant Date December 9, 2020 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Dec. 09, 2023 |  |
2020 Share Options [member] | Vesting Dates Four [member] | Grant Date June 10, 2020 [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Jun. 10, 2024 |  |
2020 Share Options [member] | Vesting Dates Four [member] | Grant Date September 9 2020 One [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2024 |  |
2020 Share Options [member] | Vesting Dates Four [member] | Grant Date September 9 2020 Two [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Sep. 09, 2024 |  |
2020 Share Options [member] | Vesting Dates Four [member] | Grant Date December 9, 2020 [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Vesting dates | Dec. 09, 2024 |  |

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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 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |