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Related-Party Transactions	12 Months Ended
Related-Party Transactions	Dec. 31, 2017
Related-Party Transactions
Related-Party Transactions	12. Related‑Party Transactions The Company entered into a full recourse promissory note with the Company’s chief executive officer, in April 2012 whereby the Company loaned Dr. Rabinowitz $154,000. This interest only loan bore interest at a rate per annum of 1.15%, compounded annually. This loan, including all accrued interest, was repaid in full by Dr. Rabinowitz in May 2015. The Company entered into a full recourse promissory note with Jonathan Sheena, the Company’s chief technology officer, in April 2012 whereby the Company loaned Mr. Sheena $38,280. This interest only loan bore interest at a rate per annum of 1.15%, compounded annually. This loan, including all accrued interest, was repaid in full by Mr. Sheena in May 2015.