Related‑Party Transactions	12 Months Ended
Related‑Party Transactions	Dec. 31, 2015
Related‑Party Transactions
Related‑Party Transactions	13. Related‑Party Transactions The chief executive officer of the Company received a monthly payment based on his use for Company business purposes of an apartment that he owned in New York City. For the years ended December 31, 2015, 2014 and 2013, the Company expensed $9,500, $22,800 and $22,642, respectively. The Company ceased making payments for this property following the sale of the apartment during the second quarter of 2015. The Company entered into a full recourse promissory note with the Company’s chief executive officer, in April 2012. Pursuant to this note, which was secured by a stock pledge agreement, 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. Pursuant to this note, which was secured by a stock pledge agreement, 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.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.