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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company subscribes to a mobile collaboration software suite from Quip, a company that was co-founded and managed by Bret Taylor, a member of the Company's Board of Directors. In April 2016, Quip was acquired by Salesforce, and subsequent to the acquisition, the Company continued to consider Quip a related party. In November 2017, Mr. Taylor was appointed to President and Chief Product Officer of Salesforce. The Company now considers the consolidated Salesforce entity to be a related party. The cost to subscribe to various cloud-based hosting arrangements from Salesforce and Quip was $1.2 million, $0.8 million and $0.5 million for the years ended December 31, 2017, 2016 and 2015, respectively, and amounts owed as of December 31, 2017 were $0.5 million. Amounts owed as of December 31, 2016 were negligible.