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Share-based compensation - Summary of Restricted Share Units Plan (Detail) - Restricted share unit plan [member]	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, beginning of year	1,100,278	1,235,202
Granted	1,818,840	971,916
Vested	(507,565)	(574,706)
Forfeited	(36,244)	(532,134)
Outstanding, end of year	2,375,309	1,100,278

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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.

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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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