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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details)	12 Months Ended
	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

X

- References

No definition available.

+ Details

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