Commitments and Contingencies - Schedule of Future Minimum Commitments of Short-Term Lease and Leases Not yet Commenced under Non-Cancellable Agreements (Details) ¥ in Thousands	Dec. 31, 2020 CNY (¥)
Commitments And Contingencies Disclosure [Abstract]
2022	¥ 484

Lessee operating lease liability short-term lease and leases not yet commenced payments due next twelve months.

No definition available.

Name:	viot_LesseeOperatingLeaseLiabilityShortTermLeaseAndLeasesNotYetCommencedPaymentsDueNextTwelveMonths
Namespace Prefix:	viot_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant