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Acquisitions - Summary of Allocation of Purchase Price and Estimated Useful Lives of the Identifiable Assets Acquired (Detail) - USD ($) $ in Thousands	May 14, 2019	Apr. 15, 2019	Oct. 01, 2018	Dec. 31, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Goodwill				$ 82,544	$ 82,544
AmOne Corp [Member]
Business Acquisition [Line Items]
Goodwill			$ 5,146
Total purchase price			30,684
AmOne Corp [Member] | Customer/publisher/advertiser relationships [Member]
Business Acquisition [Line Items]
Estimated Fair Value			$ 21,300
Estimated Useful Life			7 years
AmOne Corp [Member] | Website/trade/domain names [Member]
Business Acquisition [Line Items]
Estimated Fair Value			$ 900
Estimated Useful Life			15 years
AmOne Corp [Member] | Acquired technology and others [Member]
Business Acquisition [Line Items]
Estimated Fair Value			$ 500
Estimated Useful Life			3 years
AmOne Corp [Member] | Net assets [Member]
Business Acquisition [Line Items]
Estimated Fair Value			$ 2,838
CloudControlMedia, LLC [Member]
Business Acquisition [Line Items]
Goodwill		$ 11,562
Total purchase price		18,433
CloudControlMedia, LLC [Member] | Customer/publisher/advertiser relationships [Member]
Business Acquisition [Line Items]
Estimated Fair Value		$ 4,500
CloudControlMedia, LLC [Member] | Customer/publisher/advertiser relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Estimated Useful Life		3 years
CloudControlMedia, LLC [Member] | Customer/publisher/advertiser relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated Useful Life		4 years
CloudControlMedia, LLC [Member] | Website/trade/domain names [Member]
Business Acquisition [Line Items]
Estimated Fair Value		$ 300
Estimated Useful Life		5 years
CloudControlMedia, LLC [Member] | Acquired technology and others [Member]
Business Acquisition [Line Items]
Estimated Fair Value		$ 0
CloudControlMedia, LLC [Member] | Net assets [Member]
Business Acquisition [Line Items]
Estimated Fair Value		$ 2,071
MyBankTracker.com, LLC [Member]
Business Acquisition [Line Items]
Goodwill	$ 3,553
Total purchase price	9,724
MyBankTracker.com, LLC [Member] | Customer/publisher/advertiser relationships [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 3,400
MyBankTracker.com, LLC [Member] | Customer/publisher/advertiser relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Estimated Useful Life	3 years
MyBankTracker.com, LLC [Member] | Customer/publisher/advertiser relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated Useful Life	12 years
MyBankTracker.com, LLC [Member] | Website/trade/domain names [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 1,100
Estimated Useful Life	15 years
MyBankTracker.com, LLC [Member] | Acquired technology and others [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 0
MyBankTracker.com, LLC [Member] | Net assets [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 1,671

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- Definition

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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