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Inventories, Net (Tables)
12 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories
   As of March 31, 
   2020   2021 
   $   $ 
Raw materials   1,346    1,574 
Work in progress   234    263 
Finished goods   420    401 
    2,000    2,238