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Segment Geographic Information on Sales and Net Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Revenue, Major Customer [Line Items]      
Revenue from External Customers $ 4,252 $ 5,788  
Property and equipment, net 201   230
North America
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 41 138  
Property and equipment, net 134   177
Europe
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 2,630 4,087  
Property and equipment, net 17   52
Other Regions
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 1,581 1,562  
Property and equipment, net $ 50   $ 1