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Segment Information, Revenues by Geography and Significant Customers (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]    
Revenue for the United States $ 19.3 $ 24.4
Percentage of Accounts receivable by Major Customer 10.00%  
Percentage of revenues by Major Customer 10.00%