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Restricted cash
12 Months Ended
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]  
Restricted cash
Restricted cash
As of December 31, 2016 and December 31, 2015, the Company had $126,595 and $126,835 of restricted cash, respectively, in the form of a letter of credit. The Company maintains this letter of credit as a security deposit on the lease of its office space in Boston, Massachusetts (see Note 9).