Acquisitions - Purchase Consideration (Details) - HotelTonight $ in Thousands	Apr. 15, 2019 USD ($)
Business Acquisition [Line Items]
Cash paid to HotelTonight stockholders and equity award holders	$ 237,387
Total purchase consideration	441,357
Common stock
Business Acquisition [Line Items]
Common stock and replacement stock options	201,079
Replacement stock options
Business Acquisition [Line Items]
Common stock and replacement stock options	$ 2,891

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

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