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INCOME TAXES - Summary of changes in valuation allowance (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Income Tax Disclosure [Abstract]
Balance at beginning of the year	¥ (1,909)
Additions	(2,871)
Reversals	678
Balance at end of the year	¥ (4,102)

X

- Definition

Deferred tax assets valuation allowance additions.

+ References

No definition available.

+ Details

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

X

- Definition

Deferred tax assets valuation allowance reversals.

+ References

No definition available.

+ Details

Name:	jfin_DeferredTaxAssetsValuationAllowanceReversals
Namespace Prefix:	jfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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