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Description of Business - Additional Information (Detail)
1 Months Ended 12 Months Ended
Oct. 09, 2015
USD ($)
Oct. 05, 2015
USD ($)
May. 22, 2014
USD ($)
Patent
Feb. 28, 2014
USD ($)
Patent
Jan. 31, 2013
USD ($)
Jul. 31, 2000
USD ($)
Jul. 31, 2015
USD ($)
a
Employee
Jul. 31, 2014
USD ($)
$ / shares
Oct. 14, 2015
USD ($)
Oct. 10, 2014
USD ($)
Mar. 07, 2013
$ / shares
Entity Information [Line Items]                      
Sale of shared facilities and assets, value         $ 18,750,000            
Common stock, par value | $ / shares                     $ 0.001
Number of employees | Employee             1        
Liquidating cash distribution, per share | $ / shares               $ 0.24      
Liquidating distribution             $ 0 $ 6,932,000      
Tejas                      
Entity Information [Line Items]                      
Payment to acquire business           $ 2,200,000          
Business acquisition, approximate ownership percentage acquired           5.00%          
Tyngsborough Massachusetts                      
Entity Information [Line Items]                      
Ownership of land | a             102        
Sale of facilities and assets, value                   $ 2,500,000  
Maximum amount payable on breaches of such representations and warranties or obligations                   $ 75,000  
Expected date to complete sale             Dec. 04, 2015        
Tyngsborough Massachusetts | Termination of Restated Purchase and Sale Agreement with Tyngsborough Commons, LLC                      
Entity Information [Line Items]                      
Ownership of land | a             102        
IBM Patents                      
Entity Information [Line Items]                      
Patent sale agreement, number of patents | Patent       40              
Patent sale agreement, number of patent applications | Patent       2              
Amount received from sale of patents       $ 2,000,000              
IQstream Patents                      
Entity Information [Line Items]                      
Patent sale agreement, number of patents | Patent     3                
Patent sale agreement, number of patent applications | Patent     6                
Amount received from sale of patents     $ 300,000                
Subsequent Event | Tyngsborough Land                      
Entity Information [Line Items]                      
Estimated potential betterment fee relating to Tyngsborough Land                 $ 2,835,000    
Project completion percentage                 50.00%    
Subsequent Event | Complaint | Settled Litigation                      
Entity Information [Line Items]                      
Litigation settlement amount   $ 125,000                  
Subsequent Event | Complaint | Settled Litigation | Sycamore Networks Incorporation                      
Entity Information [Line Items]                      
Litigation settlement amount   $ 50,000                  
Subsequent Event | Tyngsborough Massachusetts                      
Entity Information [Line Items]                      
Deposit held in escrow $ 350,000