XML 181 R19.htm IDEA: XBRL DOCUMENT

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions We subscribe to a mobile collaboration software suite from Quip, a company that was co-founded and managed by Bret Taylor, a member of our Board of Directors. In April 2016, Quip was acquired by Salesforce, and subsequent to the acquisition, we continue to consider Quip a related party. In November 2017, Mr. Taylor was appointed to President and Chief Product Officer of Salesforce. We now consider the consolidated Salesforce entity to be a related party. The cost to subscribe to various cloud-based hosting arrangements from Salesforce and Quip was $1.8 million, $1.2 million and $0.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. Amounts owed as of December 31, 2018 and 2017 were negligible.