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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

X

- 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

X

- 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