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Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Inventory Disclosure [Abstract]      
Raw materials $ 4,038 $ 4,963  
Work-in-progress 2,372 4,437  
Finished goods 1,704 1,428  
Total inventories 8,114 10,828  
Obsolescence allowance at beginning of the year 3,887 3,554 $ 3,450
Additional charges/(usage), net (252) 341 134
Written off (8) (30)
Obsolescence allowance at the end of the year $ 3,635 $ 3,887 $ 3,554