Subsequent events - Additional Information (Detail) - Subsequent Event [Member] - Nanjing Animal Pharmaceutical [Member] ¥ in Thousands	Apr. 30, 2023 CNY (¥)
Subsequent Events [Line Items]
Line of Credit Facility, Periodic Payment, Principal	¥ 6,000
Line of Credit Facility, Periodic Payment, Interest	840
Additional compensation of line of credit	¥ 1,060

Amount of the required periodic payment applied to principal.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration