Related‑Party Transactions	6 Months Ended
Related‑Party Transactions	Jun. 30, 2015
Related‑Party Transactions
Related‑Party Transactions	12. Related‑Party Transactions The chief executive officer of the Company receives a monthly payment based on his use for Company business purposes of an apartment that he owns in New York City. For the three months ended June 30, 2015 and 2014, the Company expensed $3,800 and $5,700, respectively. For the six months ended June 30, 2015 and 2014, the Company expensed $9,500 and $11,400, respectively. The Company will not make payments for this apartment in the future due to 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 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 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.