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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) | 12 Months Ended
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Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Period for considering vehicle as slow moving | 90 days

X
- Definition Represents the period for considering vehicle as slow moving. + References No definition available. + Details
Name: | kxin_PeriodForConsideringVehicleAsSlowMoving
Namespace Prefix: | kxin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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