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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2016
Related Party Transactions
Related Party Transactions	10. Related Party Transactions During the six months ended June 30, 2016 and 2015, the Company paid one of its investors $733,000 and $1,450,000, respectively, for external research and preclinical development services. During the six months ended June 30, 2015, the Company paid $244,000 to one of its investors for rent related to the Company’s operating lease that expired in August 2015. No payments were made to this investor for the six months ended June 30, 2016.