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Inventories (Tables)
12 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net of Allowances

 

          March 31,
   2015       2016  
    
Raw materials  $4,963   $4,038 
Work-in-progress   4,437    2,372 
Finished goods   1,428    1,704 
   $10,828   $8,114 
           

 

Schedule of Obsolescence Allowance for Inventory

   Year ended March 31
   2014  2015  2016
          
Balance at beginning of the year  $3,450   $3,554   $3,887 
Additional charges/(usage), net   134    341    (252)
Written off   (30)   (8)   —   
Balance at the end of the year  $3,554   $3,887   $3,635