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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES - Warranty terms (Details)
 12 Months Ended
Dec. 31, 2023
km
Lithium-ion battery packs, model 1  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 24 months
Kilometers covered under warranty 20,000
Lithium-ion battery packs, model 2  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 36 months
Kilometers covered under warranty 30,000
Minimum  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 6 months
Minimum | Smart electric-scooters  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 6 months
Minimum | Key components of electric scooters  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 12 months
Maximum  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 36 months
Maximum | Smart electric-scooters  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 36 months
Maximum | Key components of electric scooters  
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES  
Warranty term 24 months