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Inventories, Net (Tables)
12 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories

   As of March 31, 
   2018   2019 
   $   $ 
         
Raw materials   2,112    1,200 
Work in progress   116    40 
Finished goods   705    299 
    2,933    1,539