Commitments and Contingencies (Details Textual)							1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 11, 2017 USD ($)	Jul. 11, 2017 USD ($)	Apr. 11, 2017 USD ($)	Mar. 07, 2017 USD ($)	Feb. 11, 2017 USD ($)	Jan. 11, 2017 USD ($) Installments	Jun. 30, 2013 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Feb. 07, 2017 USD ($)
Subsequent Event [Member]
Commitments and Contingencies (Textual)
Payment of installment												$ 4,000,000
Description of legal settlement agreement				The Company will provide for a $2.25 million initial payment (the "Initial Payment") and a $7.2 million additional payment (the "Additional Payment"). The Initial Payment will be paid into an escrow account within 15 days following preliminary court approval of the settlement, and will be fully covered by insurance policies maintained by the Company. The Additional Payment of $7.2 million will be paid within 60 days after the closing of a transaction to sell the Company's spectrum licenses as specified in the Consent Decree with the Federal Communications Commission dated January 11, 2017 (the "Consent Decree"), or, in the event that the Company pays the non-transfer penalty specified in the Consent Decree, within 60 days after that payment is paid.
Settlement of initial payment				$ 2,250,000
Additional settlement payment				$ 7,200,000
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%
Subsidiaries [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
Amount incurred for obligation								$ 22,000	$ 30,000	$ 39,000	$ 30,000
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.
Straight Path Spectrum'S Spectrum Licenses [Member]
Commitments and Contingencies (Textual)
Payments to be made from revenue, percentage						20.00%
Payments of initial civil penalty						$ 15,000,000
Number of instalments | Installments						4
Payments of additional penalty						$ 85,000,000
Straight Path Spectrum'S Spectrum Licenses [Member] | Subsequent Event [Member]
Commitments and Contingencies (Textual)
Installment value	$ 3,500,000	$ 3,500,000	$ 4,000,000		$ 4,000,000