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PREPAYMENTS AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2022
PREPAYMENTS AND OTHER CURRENT ASSETS  
Summary of prepayments and other current assets

As of December 31, 

    

2021

    

2022

US$

US$

Prepayments

 

1,562,177

 

1,161,910

Deposits (a)

 

1,873,843

 

2,970,421

Others

 

619,901

 

804,992

 

4,055,921

 

4,937,323

Note (a): The deposits represented the amounts that the Group paid to its CRO vendors for various outsourced research and development programs according to the terms of respective CRO agreements. The Group expects to recover the deposits if the programs fail or the agreements are cancelled.