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Financial instruments - Summary of key Assumptions used to Determine the Fair Value of Assets Held For Sale (Detail) - Assets Held for Sale	12 Months Ended
	Dec. 31, 2020 USD ($)
Sale Price
Disclosure Of Information About Key Assumptions Used To Determine The Fair Value Of Assets Held For Sale Explanatory [Line Items]
Unobservable input	Sales price
Value assigned to key assumption	$ 145,399
Approach to determining key assumption	Average of purchase proposals received
Cost of Disposal
Disclosure Of Information About Key Assumptions Used To Determine The Fair Value Of Assets Held For Sale Explanatory [Line Items]
Unobservable input	Cost of disposal
Value assigned to key assumption	$ (9,857)
Approach to determining key assumption	Estimated based on the Company’s experience with disposal of similar assets.

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- Definition

Disclosure Of Information About Key Assumptions Used To Determine The Fair Value Of Assets Held For Sale Explanatory.

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- Definition

Fair value less costs of disposal of value assigned to key assumption.

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- Definition

The description of key assumptions on which management has based its determination of fair value less costs of disposal for a cash-generating unit (group of units). Key assumptions are those to which the unit's (group of units') recoverable amount is most sensitive. [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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The explanation of the value(s) assigned to key assumption(s) on which management has based its determination of recoverable amount for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

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