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Organization and principal activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 10, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Organization and principal activities (Details) [Line Items]        
Settle obligations Of VIEs amounting   $ 3,800 $ 3,800 $ 3,800
Offering expenses   29,904
Loss from operations   19,200 45,900 63,000
Net cash used in operating activities   4,404 (21,738) (2,038)
Cash and cash equivalents and short-term deposit   15,100    
Short-Term Investments   11,700    
Consolidated Entity, Excluding Consolidated VIE [Member]        
Organization and principal activities (Details) [Line Items]        
Net cash used in operating activities   $ 4,400 $ 21,700 $ 2,000
IPO [Member]        
Organization and principal activities (Details) [Line Items]        
Sale of stock, shares issued (in Shares) 2,010,000      
Class A Ordinary Shares [Member] | IPO [Member]        
Organization and principal activities (Details) [Line Items]        
Ordinary shares issued (in Shares) 20,100,000      
Sale of stock, price per share (in Dollars per share) $ 18      
American Depositary Receipts [Member] | IPO [Member]        
Organization and principal activities (Details) [Line Items]        
Sale of stock, price per share (in Dollars per share) $ 18      
Offering expenses $ 27,600      
Mr. Chaohui Chen and Mr. Zhiping Peng [Member]        
Organization and principal activities (Details) [Line Items]        
Redesignation of ordinary shares (in Shares)   122,072,980