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Related-Party Transactions	12 Months Ended
Related-Party Transactions	Dec. 31, 2018
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions Board of Directors' Appointment We were party to various agreements and contracts with Medtronic, one of our stockholders. Under these agreements and contracts, Medtronic was allowed to name one person to be a member of our board of directors. In connection with the Series F Preferred Stock purchase agreement in 2016, Medtronic agreed to move from one voting member of our board of directors to two non-voting members. This right terminated in connection with the completion of our IPO. Supply Agreement In the past, we contracted with Medtronic to supply all of our commercial and clinical requirements of certain components used to manufacture the Inspire system. The Supply Agreement expired on June 5, 2017 but was extended to allow Medtronic to complete a final build of the pressure sensor used in our original pressure sensing lead, which was completed in 2018. We purchased inventory with Medtronic, a related party until our IPO, of $0.3 million, $1.1 million, and $0.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.