Business Combinations - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) business	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired \| business		2
Goodwill	$ 55,168	$ 55,168	$ 0
Mojo Networks, Inc and Metamako Holdings PTY LTD Acquisitions
Business Acquisition [Line Items]
Total consideration transferred	116,500
Cash transferred to acquire businesses	100,900
Stock issued to acquire businesses, fair value	$ 15,600
Common stock issued (shares) \| shares	58,072
Number of businesses acquired \| business		2
Goodwill	$ 55,168	$ 55,168

Number of shares of equity interests issued or issuable to acquire entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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