Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
	Mar. 07, 2017	Jan. 11, 2017	Oct. 31, 2010	Jul. 31, 2017
Description of Business and Summary of Significant Accounting Policies (Textual)
Initial payment	$ 2,250,000
Initial civil penalty payment		$ 15,000,000
Additional settlement payment	$ 7,200,000
Non-refundable fee				$ 207,000
Income tax position, percentage of ultimate settlement				50
Straight Path Spectrum [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Percentage of ownership				100.00%
Renewal of 39 GHz FCC licenses			$ 210,000
License patent expiration date			Oct. 18, 2020
Description of license			The Company included the license renewal costs in other assets, which are being charged to expense on a straight-line basis over the ten-year term of the licenses.
Straight Path IP Group [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Percentage of ownership				84.50%
Settlement of litigation, description				Intellectual property rights a percentage of the amounts recovered ranging from 0% to 40% depending on several factors.
Straight Path IP Group [Member] | October 2, 2017 [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Non-refundable fee				$ 100,000
Straight Path Ventures [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Percentage of ownership				100.00%