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Share-based payments - Summary of Options Granted Priced Using Black Scholes for SARs, Tandem Awards, Converted Options, Matching Stock Options and Monte Carlo Option Pricing Model (Detail) |  |  |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 17, 2020 yr $ / shares | Sep. 14, 2020 yr $ / shares | Jun. 30, 2020 yr $ / shares | Sep. 30, 2019 yr $ / shares | Dec. 31, 2019 yr $ / shares | Dec. 31, 2018 yr $ / shares
2016 Tandem Awards [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price |  |  |  | $ 18.30 | $ 23.82 | $ 16.65
Underlying share price |  |  |  | $ 16.94 | $ 67.87 | $ 27.21
Volatility |  |  |  | 78.00% | 73.00% | 64.00%
Time period (years) | yr |  |  |  | 2.10 | 1.25 | 5.00
Risk free rate |  |  |  | 2.04% | 1.59% | 2.77%
Dividend yield |  |  |  | 0.00% | 0.00% | 0.00%
Combined probability of exit events |  |  |  | 60.00 | 80.00 | 25.00
Matching Stock Options [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price |  |  | $ 10.00 |  |  |
Underlying share price |  |  | $ 15.15 |  |  |
Volatility |  |  | 75.00% |  |  |
Time period (years) | yr |  |  | 5.5 |  |  |
Risk free rate |  |  | 0.29% |  |  |
Dividend yield |  |  | 0.00% |  |  |
Share Appreciation Rights [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price |  |  |  |  | $ 1.12 | $ 1.12
Underlying share price |  |  |  |  | $ 67.87 | $ 27.21
Volatility |  |  |  |  | 73.00% | 64.00%
Time period (years) | yr |  |  |  |  | 1.25 | 5.00
Risk free rate |  |  |  |  | 1.59% | 2.77%
Dividend yield |  |  |  |  | 0.00% | 0.00%
Combined probability of exit events |  |  |  |  | 80.00 | 25.00
Additional Grants Under 2020 Plan [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price | $ 9.70 | $ 10.00 | $ 10.00 |  |  |
Underlying share price | $ 9.70 | $ 9.16 | $ 15.15 |  |  |
Volatility | 84.00% | 79.00% | 75.00% |  |  |
Time period (years) | yr | 6.0 | 6.2 | 7.0 |  |  |
Risk free rate | 0.49% | 0.37% | 0.29% |  |  |
Dividend yield | 0.00% | 0.00% | 0.00% |  |  |
Performance Based Options [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price |  | $ 10.00 | $ 10.00 |  |  |
Underlying share price |  | $ 9.16 | $ 15.15 |  |  |
Volatility |  | 78.00% | 79.00% |  |  |
Time period (years) | yr |  | 6.7 | 7.0 |  |  |
Risk free rate |  | 0.67% | 0.66% |  |  |
Dividend yield |  | 0.00% | 0.00% |  |  |
Converted Options [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price |  |  | $ 2.47 |  |  |
Underlying share price |  |  | $ 15.15 |  |  |
Volatility |  |  | 75.00% |  |  |
Time period (years) | yr |  |  | 5.6 |  |  |
Risk free rate |  |  | 0.29% |  |  |
Dividend yield |  |  | 0.00% |  |  |

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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 option life of share options granted. + 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 exercise price of share options granted. + 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 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 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 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 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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