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Land Use Rights, Net - Additional Information (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Land Use Rights Net [Abstract] |  |
Amortization expense | ¥ 1,260 | ¥ 636

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- Definition Amortization of land use rights. + References No definition available. + Details
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Namespace Prefix: | viot_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Land use rights, net. + References No definition available. + Details
Name: | viot_LandUseRightsNetAbstract
Namespace Prefix: | viot_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration