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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company engages Dr. Mark Kroll, a member of the Board of Directors, to provide consulting services. The expenses related to these services were approximately $0.2 million for each of the years ended December 31, 2016, 2015 and 2014. At December 31, 2016 and 2015, the Company had accrued liabilities of approximately $12,000 and $31,000, respectively, related to these services. The Company subscribes to a mobile collaboration software suite co-founded and managed by Bret Taylor, a member of the Company's Board of Directors. The cost to license this software is approximately $0.1 million per year, and as of December 31, 2016 and 2015 the Company had $50,500 and $36,000, respectively, of prepaid costs related to the license subscription.