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Restricted Cash	9 Months Ended
Restricted Cash	Sep. 30, 2017
Restricted Cash
Restricted Cash	(9) Restricted Cash As part of the Company’s lease arrangement for its office and laboratory facility in Cambridge, Massachusetts, the Company is required to restrict cash held in a certificate of deposit securing a line of credit for the lessor. As of September 30, 2017 and December 31, 2016, the restricted cash amounted to $0.3 million held in certificates of deposit securing a line of credit for the lessor. The lease expires August 2022.