Business Combinations - Allocation of Estimated Fair Values of Net Assets Acquired (Details) - USD ($) $ in Thousands |
9 Months Ended | |
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Sep. 30, 2018 |
Dec. 31, 2017 |
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| Business Acquisition [Line Items] | ||
| Goodwill | $ 178,917 | $ 71,243 |
| AdsWizz | ||
| Business Acquisition [Line Items] | ||
| Finite-lived intangible assets | 44,600 | |
| Tangible assets acquired, net | 1,581 | |
| Deferred tax liabilities | (7,216) | |
| Net assets acquired | 38,965 | |
| Goodwill | 107,673 | |
| Total fair value consideration | 146,638 | |
| AdsWizz | Developed technology | ||
| Business Acquisition [Line Items] | ||
| Finite-lived intangible assets | $ 32,000 | |
| Estimated useful life in years | 4 years | |
| AdsWizz | Customer relationships | ||
| Business Acquisition [Line Items] | ||
| Finite-lived intangible assets | $ 12,000 | |
| Estimated useful life in years | 4 years | |
| AdsWizz | Trade name | ||
| Business Acquisition [Line Items] | ||
| Finite-lived intangible assets | $ 600 | |
| Estimated useful life in years | 4 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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- Definition Amount of assets acquired at the acquisition date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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