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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company subscribes to various cloud-based applications from Salesforce. Bret Taylor, a member of the Company's Board of Directors, serves as President and Chief Product Officer of Salesforce. The Company incurs costs at different times throughout the year, typically in advance of services being provided, and subsequently amortizes these costs ratably to expense as services are provided over the contractual term. The Company made payments of $1.7 million related to these services during each of the three and six months ended June 30, 2018, and made payments of $0.2 million and $1.2 million during the three and six months ended June 30, 2017, respectively.