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Accounts Receivable, Net (Tables)
 12 Months Ended
Mar. 31, 2019
Accounts Receivable Net Tables  
Schedule of accounts receivable, net

   As of March 31, 
   2018   2019 
   $   $ 
         
Accounts receivable   2,223    2,264 
Allowances for doubtful receivables   -    - 
    2,223    2,264 
Schedule of allowances for doubtful accounts receivables

   Year ended March 31, 
   2017   2018   2019 
   $   $   $ 
             
At beginning of year   6    66    - 
Write-down (reversal) for the year   60    (66)   - 
At end of year   66    -    -