INCOME TAX EXPENSES - Per share effect of tax holidays (Details) - ¥ / shares	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
INCOME TAX EXPENSES
Net income per share effect - basic	¥ 0.1	¥ 0.07	¥ 0.04
Net income per share effect - diluted	¥ 0.1	¥ 0.07	¥ 0.04

Income tax holiday income tax benefits per share diluted.

No definition available.

Name:	viot_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted
Namespace Prefix:	viot_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration