| Significant accounting policies - Summary of Estimated Useful Lives of Property Plant and Equipment (Detail) | 12 Months Ended | 
|---|---|
| Dec. 31, 2022 | |
| Chargers and charging infrastructure | Bottom of range | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life | 7 years | 
| Chargers and charging infrastructure | Top of range | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life | 10 years | 
| Other fixed assets | Bottom of range | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life | 3 years | 
| Other fixed assets | Top of range | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life | 10 years | 
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. No definition available. 
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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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