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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Mar. 31, 2013
Inventories    
Raw materials $ 5,692 $ 4,052
Work-in-process 419 271
Finished goods 1,873 1,514
Less: reserve (829) (261)
Total $ 7,155 $ 5,576