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DSL Service Assurance Hardware Exit - Exit cost activities (Details ) (Facility Closing, USD $)
3 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Facility Closing
   
Restructuring Reserve [Roll Forward]    
Balance $ 77,000 $ 0
Expense 101,000 181,000
Utilization   104,000
Balance $ 178,000 $ 77,000