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Inventories, Net (Tables)
12 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
   As of March 31, 
   2019   2020 
   $   $ 
         
Raw materials   1,200    1,346 
Work in progress   40    234 
Finished goods   299    420 
    1,539    2,000