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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Mar. 31, 2019
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets

   As of March 31, 
   2018   2019 
   $   $ 
         
Prepaid expenses   214    137 
Short-term rental prepayment   -    79 
Payment in advance   67    110 
Deposit   399    373 
Other   69    23 
    749    722