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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Mar. 31, 2021
Prepaid Expenses And Other Current Assets Disclosure [Abstract]  
Schedule of prepaid expenses and other current assets
   As of March 31, 
   2020   2021 
   $   $ 
Prepaid expenses   129    198 
Payment in advance   140    291 
Deposits   108    3 
Other   11    21 
Less: expected credit loss provision   -    - 
    388    513