Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($) Customer Segment	Jul. 31, 2015 USD ($) Customer	Jul. 31, 2014 USD ($) Customer	Apr. 30, 2016 USD ($)	Apr. 14, 2016 USD ($)	Mar. 23, 2016 USD ($)	Jan. 21, 2016 USD ($)	Dec. 07, 2015 USD ($)
Description of Business and Significant Accounting Policies (Textual)
Investments accounted for using the equity method		$ 8,000	$ 9,000
Investments accounted for using the cost method		7,000	3,400
Advertising expense		12,900	16,500	$ 17,200
Amortization expense related to capitalized software		12,600	11,400	$ 8,800
Unamortized capitalized internal use software costs		$ 18,800	18,800
Number of reportable segments | Segment		2
Percentage of advertising revenue, Description		Over 90% of its revenues from selling its advertising inventory to advertising networks/exchanges, real time bidding platforms, direct advertisers and game publishers.
Deferred income tax assets		$ 476,400	$ 800
Revenue [Member]
Description of Business and Significant Accounting Policies (Textual)
Concentration risk, percentage		11.20%	11.20%	12.00%
Number of customers | Customer		5	5	5
Receivable [Member]
Description of Business and Significant Accounting Policies (Textual)
Concentration risk, percentage		23.00%	24.10%
Number of customers | Customer		5	5
Technology and domain names [Member] | Maximum [Member]
Description of Business and Significant Accounting Policies (Textual)
Amortization period		4 years
Technology and domain names [Member] | Minimum [Member]
Description of Business and Significant Accounting Policies (Textual)
Amortization period		3 years
Customer Lists [Member]
Description of Business and Significant Accounting Policies (Textual)
Amortization period		15 years
Trademarks [Member]
Description of Business and Significant Accounting Policies (Textual)
Amortization period		5 years
Equipment [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		7 years
Equipment [Member] | Maximum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		20 years
Equipment [Member] | Minimum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		5 years
Building [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		40 years
Computer Software [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		3 years
Computer Software [Member] | Maximum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		5 years
Computer Software [Member] | Minimum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		2 years
Furniture and Fixtures [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		7 years
Furniture and Fixtures [Member] | Maximum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		10 years
Furniture and Fixtures [Member] | Minimum [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of Long-Lived assets		5 years
Internal-use Software [Member]
Description of Business and Significant Accounting Policies (Textual)
Estimated useful lives of internal-use software		Excess of one year.
Cornerstone [Member]
Description of Business and Significant Accounting Policies (Textual)
Maximum amount of investment approved									$ 10,000
Initial amount of investment funded upon signing the Subscription and Loan Agreement									2,000
Initial amount of investment amounts paid						$ 1,450	$ 50	$ 500
Convertible promissory note, principal amount									$ 2,000
Convertible promissory note, rate of interest									3.50%
Investments		$ 2,000
Maximum exposure to loss		$ 2,000
Cornerstone [Member] | Convertible promissory note [Member] | Howard and Deborah Jonas [Member]
Description of Business and Significant Accounting Policies (Textual)
Convertible notes conversion features, description		The Series C Notes are convertible into capital stock of Cornerstone and, depending on the valuation at the time of conversion, the combined interests of the Jonases and The Howard S. and Deborah Jonas Foundation represent between 1% and 2% of the total capital stock of Cornerstone.
Series C Convertible notes					$ 525
Cornerstone [Member] | Convertible promissory note [Member] | The Howard S. and Deborah Jonas Foundation [Member]
Description of Business and Significant Accounting Policies (Textual)
Convertible notes conversion features, description		The Series C Notes are convertible into capital stock of Cornerstone and, depending on the valuation at the time of conversion, the combined interests of the Jonases and The Howard S. and Deborah Jonas Foundation represent between 1% and 2% of the total capital stock of Cornerstone.
Series C Convertible notes					$ 525
CS Pharma [Member]
Description of Business and Significant Accounting Policies (Textual)
Description on rights of warrants exercise		The Cornerstone warrant entitles the holder to purchase shares of capital stock of Cornerstone representing 56% of the then issued and outstanding capital stock of Cornerstone, on an as-converted and fully diluted basis. The minimum initial and subsequent exercises of the warrant shall be for such number of shares that will result in at least $5 million of gross proceeds to Cornerstone, or such lesser amount as represents 5% of the outstanding capital stock of Cornerstone, or such lesser amount as may then remain unexercised.
Warrants expiry date		Dec. 31, 2020
Issuance of member interests in exchange of cash		$ 10,000
Proceeds from issuance of member interests		$ 8,800
Percentage of interest in CS Pharma		50.00%
Variable interest entity warrants ownership percentage		$ 10,000
CS Pharma [Member] | Convertible promissory note ("Series D Note") [Member]
Description of Business and Significant Accounting Policies (Textual)
Convertible notes conversion features, description		The Series D Note also includes a mandatory conversion into Cornerstone common stock upon a qualified initial public offering, and conversion at the holder's option upon an unqualified financing event. In all cases, the Series D Note conversion price is based on the applicable financing purchase price.
Subsequent Event [Member] | CS Pharma [Member]
Description of Business and Significant Accounting Policies (Textual)
Proceeds from issuance of member interests	$ 1,200
Subsequent Event [Member] | CS Pharma [Member] | Convertible promissory note ("Series D Note") [Member]
Description of Business and Significant Accounting Policies (Textual)
Remaining amount of investment funded	8,000
Convertible promissory note, principal amount	$ 10,000
Convertible promissory note, rate of interest	3.50%
Convertible promissory note, maturity date	Sep. 16, 2018