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Related party transactions	9 Months Ended
Related party transactions	Sep. 30, 2016
Related Party Transactions [Abstract]
Related party transactions	Related party transactions The Company has agreements for certain contract manufacturing and engineering services with a vendor affiliated with one of the Company's investors. The Company recorded no expense in the nine months ended September 30, 2016 and 2015. The Company made payments of $0.2 million to this vendor in 2015. As of September 30, 2016 and December 31, 2015, the Company had no accounts payable associated with this vendor. The Company incurs costs for Company-related chartered aircraft fees for the use of the CEO’s private plane. The Company recorded expense of $0.7 million and $0.7 million in the nine months ended September 30, 2016 and 2015, respectively. As of September 30, 2016 and December 31, 2015, the Company had accounts payable associated with these aircraft fees of zero and $0.1 million, respectively. In 2013, the Company entered into a three-year agreement, which was amended in July 2016 to continue through the end of 2016, with a company affiliated with the son of one of the members of the Company's board of directors to acquire certain naming rights to a kart racing facility. As consideration for these naming rights, the Company paid $0.5 million over the three year period. As of September 30, 2016, the Company has recorded cumulative expense of $0.5 million, and has also provided 100 GoPro cameras at no cost each year. As of September 30, 2016 and December 31, 2015, the Company had no accounts payable associated with this agreement. See Notes 6 and 7 above for information regarding CEO RSUs and Class B common stock contributed by the CEO back to the Company.