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Accounts Receivable, Net (Tables)
 12 Months Ended
Mar. 31, 2020
Accounts Receivable Net Tables  
Schedule of accounts receivable, net

   As of March 31, 
   2019   2020 
   $   $ 
         
Accounts receivable   2,264    2,008 
Allowances for doubtful receivables   -    - 
    2,264    2,008 
Schedule of allowances for doubtful accounts receivables
   Year ended March 31, 
   2018   2019   2020 
   $   $   $ 
             
At beginning of year   66    -    - 
Reversal for the year   (66)   -    - 
At end of year   -    -    -