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Commitments and Contingencies (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 24, 2014
Patent
Jun. 30, 2013
USD ($)
Jan. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
License
Jan. 31, 2015
USD ($)
Commitments and Contingencies (Textual)            
Infringe of patents | Patent 4          
Prepaid expense fee         $ 1,000,000  
Research and development expenses     $ 374,000   374,000  
Prepaid expenses     700,000   $ 700,000  
Lease expiration date         Dec. 31, 2018  
Annual rent         $ 18,000  
Minimum [Member]            
Commitments and Contingencies (Textual)            
Recoverable contingency patents allegedly infringed, percentage         0.00%  
Maximum [Member]            
Commitments and Contingencies (Textual)            
Recoverable contingency patents allegedly infringed, percentage         40.00%  
Straight Path Spectrum [Member] | 39 GHz Economic Area [Member]            
Commitments and Contingencies (Textual)            
License expiration date         Oct. 18, 2020  
Straight Path Spectrum [Member] | LMDS 28 GHz range [Member] | NEW YORK [Member]            
Commitments and Contingencies (Textual)            
License expiration date         Feb. 01, 2016  
Straight Path Spectrum [Member] | LMDS 28 GHz range [Member] | Licenses expire on august 10, 2018 [Member]            
Commitments and Contingencies (Textual)            
Licenses to be expired | License         14  
License expiration date         Aug. 10, 2018  
Straight Path Spectrum [Member] | LMDS 28 GHz range [Member] | Licenses expire on September 21,2018 [Member]            
Commitments and Contingencies (Textual)            
Licenses to be expired | License         118  
License expiration date         Sep. 21, 2018  
Straight Path Spectrum [Member] | Former Chief Executive Officer [Member]            
Commitments and Contingencies (Textual)            
Payments to be made from revenue, percentage   50.00%        
Amount of maximum future payment for wireless spectrum licenses   $ 3,250,000        
Cumulative amount paid for payment from future revenues from spectrum obligation     $ 30,000 $ 7,000 $ 30,000 $ 8,000
Straight Path IP Group [Member]            
Commitments and Contingencies (Textual)            
Settlement of litigation, description         Straight Path IP Group generally pays law firms that represent it in litigation against alleged infringers of its intellectual property rights a percentage of the amounts recovered ranging from 0% to 40% depending on several factors.