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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Mar. 31, 2022
Prepaid Expenses And Other Current Assets Disclosure [Abstract]  
Schedule of prepaid expenses and other current assets
   As of March 31, 
   2021   2022 
   $   $ 
         
Prepaid expenses   198    145 
Payment in advance   291    154 
Deposits   3    295 
Other   21    26 
           
    513    620