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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Statement Of Cash Flows [Abstract]
Disposal of a subsidiary, net of cash disposed	¥ 7,606
Net proceeds from issuance of ordinary shares, net of issuance cost	¥ 30,234

X

- Definition

Disposal of subsidiary net of cash disposed.

+ References

No definition available.

+ Details

Name:	jfin_DisposalOfSubsidiaryNetOfCashDisposed
Namespace Prefix:	jfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Net proceeds from issuance of ordinary shares net of issuance cost.

+ References

No definition available.

+ Details

Name:	jfin_NetProceedsFromIssuanceOfOrdinarySharesNetOfIssuanceCost
Namespace Prefix:	jfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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