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INCOME TAXES - Summary of changes in valuation allowance (Detail) ¥ in Thousands | 12 Months Ended
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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)

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- 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

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- Definition Deferred tax assets valuation allowance reversals. + References No definition available. + Details
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Namespace Prefix: | jfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- 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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration