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Discontinued operations - Summary of Disposal Group Including Discontinued Operation Balance Sheet (Detail) - Academic After-school Tutoring Business [Member] - Discontinued Operations [Member]
¥ in Thousands
Dec. 31, 2021
CNY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Inventories ¥ 204
Prepayment and other current assets 293
Total current assets 497
Property, equipment and software, net 1,088
Total non-current assets 1,088
Total assets ¥ 1,585