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Loan Payable (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 01, 2017
Nov. 01, 2017
Oct. 02, 2017
Sep. 01, 2017
Aug. 02, 2017
Jul. 03, 2017
Feb. 06, 2017
Oct. 22, 2017
Oct. 31, 2017
Apr. 30, 2017
Oct. 31, 2016
Jul. 31, 2017
Loan Payable (Textual)                        
Loans payable                 $ 3,334,000     $ 11,274,000
Proceeds from aggregate warrants                 1,057,000    
Amendment and waiver agreement, description              

 Significant terms of the Amended Loan Agreement include the following: 

 1.The maturity date of the loan was changed to the earlier of (i) March 31, 2018 or (ii) the consummation of the Merger.

 

 2.The Company paid the Lenders $8.5 million of the outstanding Loan Amount and a 1% prepayment premium of $85,000.

 

 3.Each warrantholder is entitled to elect, solely at the discretion of the warrantholder, to exercise any warrants held by such warrantholder (i) by cashless exercise in accordance with their terms or (ii) by paying the applicable warrant price per share (in which case such exercise will not result in any corresponding reduction of the Loan Amount and interest outstanding).

 

 4.
The Company paid the Lenders an amendment fee of $38,754.


 5.The Lenders consented to the sale of Straight Path IP Group by the Company and the release of the security interest related to Straight Path IP Group.

 

 6.No additional warrants shall be issued after December 1, 2017.
        
Class B common stock [Member]                        
Loan Payable (Textual)                        
Warrant issued to purchase common stock     5,152 5,188 6,911 6,899 252,161     147,682    
Warrants exercise price     $ 180.48 $ 179.18 $ 179.26 $ 179.62 $ 34.70          
Warrants expire date             Dec. 31, 2018          
Proceeds from aggregate warrants             $ 7,500,000          
Subsequent Event [Member] | Class B common stock [Member]                        
Loan Payable (Textual)                        
Warrant issued to purchase common stock 1,605 1,610                    
Warrants exercise price $ 182.02 $ 181.29                    
Loan Agreement [Member]                        
Loan Payable (Textual)                        
Borrowed from investors             $ 17,500,000          
Interest rate             5.00%          
Interest rate, increased             10.00%          
Loan maturity date             Dec. 29, 2017          
Payments of initial civil penalty             $ 15,000,000          
Payments of first installments                 $ 5,125,000      
Warrant issued to purchase common stock                 147,682      
Percentage of warrant description                 The Lenders were entitled to receive additional warrants on a monthly basis with an aggregate value equal to 10% of the then outstanding Loan Amount for the months of July 2017 and August 2017 and then 7.5% of the then outstanding Loan Amount for the months of August 2017 through December 2017.      
Cash costs                       80,000
Amortization amount                 $ 530,000     0
Amortization in discontinued operations                 119,000     0
Interest expense, debt                 306,000     0
Interest expense in discontinued operations                 76,000     0
Loans payable                 3,334,000     11,274,000
Unamortized debt discounts                 $ 541,000     $ 1,101,000