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Related Parties	12 Months Ended
Related Parties	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Parties	Related Parties In October 2015, the Company entered into a five-year service agreement with Flagship Pioneering (“Flagship”), an affiliate of one of its stockholders, Flagship Venture Funds,to provide general and administrative services to the Company, including certain consulting services and the provision of employee health and dental benefit plans for the Company’s employees. The Company made cash payments to Flagship, for services received under this agreement, of $1.2 million during the year ended December 31, 2020. As of December 31, 2021 and 2020, the Company had no accounts payable to Flagship for costs related to the service agreement. This agreement expired in 2020. In October 2015, the Company entered into a five-year consulting agreement with a scientific founder of the Company who is also a board member and a shareholder. In October 2020, this agreement was extended to January 1, 2022, and is subject to automatic one-year renewal terms until terminated. During the years ended December 31, 2021 and 2020, the Company paid the scientific founder $0.1 million and $0.2 million, respectively. As of December 31, 2021 and 2020, the Company had less than $0.1 million in accounts payable to this scientific founder.