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Prepayments and other current assets - Schedule of Prepayment and Other Current Assets (Parenthetical) (Details) ¥ in Thousands, $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Impairment charges	$ 0	¥ 4,500

X

- Definition

Impairment for loans receivables.

+ References

No definition available.

+ Details

Name:	jg_ImpairmentForLoansReceivables
Namespace Prefix:	jg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration