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Acquisitions - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands | Jun. 08, 2016 | Dec. 08, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 21, 2015 | Oct. 02, 2014
--- | --- | --- | --- | --- | --- | ---
Liabilities assumed: |  |  |  |  |  |
Goodwill |  |  | $ 166,256 | $ 166,256 |  |
Q Interactive​, LLC [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Accounts receivable | $ 4,673 |  |  |  |  |
Prepaid expenses and other current assets | 213 |  |  |  |  |
Property and equipment | 73 |  |  |  |  |
Intangible assets, net | 14,590 |  |  |  |  |
Total assets acquired | 19,549 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Trade accounts payable | 2,297 |  |  |  |  |
Accrued expenses and other current liabilities | 1,153 |  |  |  |  |
Deferred revenue | 52 |  |  |  |  |
Total liabilities assumed | 3,502 |  |  |  |  |
Goodwill | 5,384 |  | 5,384 | 5,384 |  |
Total consideration | 21,431 |  |  |  |  |
Q Interactive​, LLC [Member] | Customer Relationship [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net | 4,900 |  |  |  |  |
Q Interactive​, LLC [Member] | Trade Names [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net | 1,700 |  |  |  |  |
Q Interactive​, LLC [Member] | Acquired Proprietary Technology [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net | 2,150 |  |  |  |  |
Q Interactive​, LLC [Member] | Databases [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net | 4,800 |  |  |  |  |
Q Interactive​, LLC [Member] | Non-competition Agreements [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net | $ 1,040 |  |  |  |  |
Fluent Acquisition [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  | $ 6,013 |  |  |  |
Accounts receivable |  | 20,250 |  |  |  |
Prepaid expenses and other current assets |  | 691 |  |  |  |
Property and equipment |  | 242 |  |  |  |
Intangible assets, net |  | 85,236 |  |  |  |
Other non-current assets |  | 763 |  |  |  |
Total assets acquired |  | 113,195 |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Accounts payable and accrued expenses |  | 10,653 |  |  |  |
Liability for employee incentive-based compensation plan |  | 4,000 |  |  |  |
Deferred revenue |  | 314 |  |  |  |
Deferred tax liabilities |  | 30,800 |  |  |  |
Total liabilities assumed |  | 45,767 |  |  |  |
Goodwill |  | 155,645 | 155,645 | 155,645 |  |
Total consideration |  | 223,073 |  |  |  |
Including: |  |  |  |  |  |
Cash consideration |  | 99,266 |  |  |  |
Fluent Acquisition [Member] | Common Stock [Member] |  |  |  |  |  |
Including: |  |  |  |  |  |
Fair value of common stock, as converted, issued |  | 123,807 |  |  |  |
Fluent Acquisition [Member] | Customer Relationship [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | 30,086 |  |  |  |
Fluent Acquisition [Member] | Trade Names [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | 16,357 |  |  |  |
Fluent Acquisition [Member] | Domain Names [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | 191 |  |  |  |
Fluent Acquisition [Member] | Proprietary Technology [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | 11,382 |  |  |  |
Fluent Acquisition [Member] | Databases [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | 26,492 |  |  |  |
Fluent Acquisition [Member] | Non-competition Agreements [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Intangible assets, net |  | $ 728 |  |  |  |
Tiger Media [Member] | Best One Inc [Member] |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 3,569 |
Accounts receivable |  |  |  |  | 1,808 |
Other current assets |  |  |  |  | 326 |
Property and equipment |  |  |  |  | 1,419 |
Intangible assets, net |  |  |  |  | 4,280 |
Long-term deferred expenses |  |  |  |  | 586 |
Total assets acquired |  |  |  |  | 11,988 |
Liabilities assumed: |  |  |  |  |  |
Trade accounts payable |  |  |  |  | 1,519 |
Accrued expenses and other payables |  |  |  |  | 736 |
Acquisition consideration payable |  |  |  |  | 464 |
Amounts due to related parties |  |  |  |  | 124 |
Deferred revenue |  |  |  |  | 80 |
Total liabilities assumed |  |  |  |  | 2,923 |
Non-controlling interests |  |  |  |  | 425 |
Goodwill |  |  |  |  | 35,472 |
Including: |  |  |  |  |  |
Total consideration |  |  |  |  | $ 44,112 |
Interactive Data [Member] |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Goodwill |  |  | $ 5,227 | $ 5,227 |  | $ 5,227

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