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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2017
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 $16,000 and $14,000 for the three months ended September 30, 2017 and 2016, respectively, and $89,000 and $111,000 for the nine months ended September 30, 2017 and 2016, respectively. At September 30, 2017 and December 31, 2016, the Company had liabilities of approximately $4,000 and $12,000, 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 of the software-as-a-service subscription is approximately $0.2 million per year, and as of September 30, 2017 and December 31, 2016 the Company had $84,000 and $50,500, respectively, of prepaid costs related to the subscription.