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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions We subscribe to various cloud-based applications from Salesforce. Bret Taylor, a member of our Board of Directors, serves as President and Chief Product Officer of Salesforce. We incur costs at different times throughout the year, typically in advance of services being provided, and subsequently amortize these costs ratably to expense as services are provided over the contractual term. We made payments of $1.7 million related to these services during the nine months ended September 30, 2018, and made payments of $1.2 million during the nine months ended September 30, 2017, respectively. Payments during the three months ended September 30, 2018 and 2017 were each less than $0.1 million.