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Restricted cash	12 Months Ended
Restricted cash	Dec. 31, 2016
Cash And Cash Equivalents [Abstract]
Restricted cash	6. Restricted cash As of December 31, 2016 and 2015, the Company maintained letters of credit of $14.4 million and $10.0 million, respectively, which are required to be collateralized with a bank account at a financial institution in accordance with the Company’s current and future headquarters’ lease agreements. At December 31, 2016, $13.8 million relates to the 60 Binney Street Lease. Subject to the terms of the lease and certain reduction requirements specified therein, including market capitalization requirements, this amount may decrease by $1.5 million on the third, fourth, and fifth anniversaries of the date the Company occupies the building.

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

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