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Legal Proceedings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
May 05, 2004
Oct. 17, 2013
Patents
Aug. 31, 2011
Apr. 30, 2014
Apr. 30, 2014
Lycatel [Member]
Jul. 31, 2013
Aerotel [Member]
Mar. 15, 2013
Aerotel [Member]
Loss Contingencies [Line Items]              
Number of patents   2          
Damages and interest awarded     $ 10.1        
Interest on damages per annum (Percentage)             9.00%
Total amount of Final Award damages             5.4
Security deposit               
Accrued litigation expense       1.2      
Term of indefeasible right to use 15 years            
Payments for legal settlements           $ 5.4