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DSL Service Assurance Software Exit (Detail Textuals) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]      
Estimated shutdown cost $ 3,000,000    
Liability for exit costs 3,788,000 3,788,000   
Deferred revenue obligations 1,179,000    
Amount charged to expense 2,832,000 2,832,000  
Asset write-offs 47,000    
Payments to employees 176,000    
Severance and Employee-Related Costs
      
Restructuring Cost and Reserve [Line Items]      
Liability for exit costs 56,000 56,000   
Deferred revenue obligations       
Amount charged to expense 232,000    
Severance and employee-related costs 397,000    
Customer Contract Termination Costs
      
Restructuring Cost and Reserve [Line Items]      
Liability for exit costs 3,732,000 3,732,000   
Deferred revenue obligations 1,179,000    
Amount charged to expense 2,553,000    
Employee Severance And Retention Bonus
      
Restructuring Cost and Reserve [Line Items]      
Employee severance and retention bonuses $ 165,000