Related-Party Transactions	9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	14. Related-Party Transactions The Company’s chief executive officer and member of the board of directors is also a managing director at MPM Asset Management, LLC, which holds an investment in the Company’s common stock.

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.

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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