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Fair value measurements (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of fair value measurement

 

December 31, 2022  Balance at Fair value   Level 1 Inputs   Level 2 Inputs   Level 3 Inputs 
Assets:                    
Short-term investments – wealth management products   4    4    -    -