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Related party transactions	6 Months Ended
	Jun. 30, 2019
Related party transactions
Related party transactions	11.         Related party transactions Atlas Venture Life Science Advisors, LLC A partner of Atlas Venture Life Science Advisors, LLC (“Atlas”), a significant investor in the Company, has served on the Company’s board of directors since 2018. In August 2018, the Company entered into a use and occupancy agreement for office space with Atlas in Cambridge, Massachusetts. The agreement commenced on August 15, 2018 and continues for an initial 9‑month period after which the agreement becomes cancelable by either party upon 60 days written notice. Base rent for the office space is approximately $12 annually (See Note 10). As of June 30, 2019, in association with the use and occupancy agreement, the Company owed $8 to Atlas, which was recorded in accrued expenses in the condensed consolidated balance sheets.

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- Definition

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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-URI http://asc.fasb.org/topic&trid=2122745

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