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Acquisitions - Summary of Preliminary Allocation of Purchase Price and Estimated Useful Lives of Identifiable Assets Acquired (Detail) - USD ($) $ in Thousands | Oct. 01, 2018 | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 67,429 | $ 62,283
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 |  |
Estimated Useful Life | 0 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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