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Segment Geographic Information on Sales and Net Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Revenue, Major Customer [Line Items]      
Revenue from External Customers $ 2,203 $ 3,831  
Property and equipment, net 317   230
North America
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 17 107  
Property and equipment, net 139   177
Europe
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 1,682 2,835  
Property and equipment, net 37   52
Other Regions
     
Revenue, Major Customer [Line Items]      
Revenue from External Customers 504 889  
Property and equipment, net $ 141   $ 1