Restricted Cash	12 Months Ended
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Restricted Cash	. Restricted cash As of December 31, 2021, the Company had restricted cash of $4.2 million held as letters of credit issued by an FDIC-insured financial institution as security deposits, as required under the Company’s 4 Hartwell Place and 35 CambridgePark Drive lease agreements. As of December 31, 2021, and 2020, all restricted cash was classified as a non-current asset because the associated lease terms expired more than 12 months from the respective consolidated balance sheet date, respectively.

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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