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Acquisitions - 2017 Acquisitions summary of Fair Value of the Consideration (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 65,181 | $ 24,673
Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Net tangible assets | $ 60 |  |
Total acquired intangible assets | 5,930 |  |
Total identifiable assets acquired | 5,990 |  |
Goodwill | 9,024 |  |
Total fair value of purchase consideration | 15,014 |  |
Trade and domain names | Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Total acquired intangible assets | 50 |  |
Domain names | Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Total acquired intangible assets | 230 |  |
Non-compete agreements | Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Total acquired intangible assets | 70 |  |
Developed technologies and content library | Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Total acquired intangible assets | 5,510 |  |
Content library | Cogeon GmbH |  |  |
Business Acquisition [Line Items] |  |  |
Total acquired intangible assets | $ 70 |  |

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