Related Party Transactions	12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	14. Related Party Transactions Since the Company’s incorporation in July 2016, the Company has engaged in transactions with related parties. During the year ended December 31, 2017, the Company issued 1,886,363 shares of common stock and made payments to PureTech for certain founding services and cost reimbursements. PureTech is a founder of the Company and holds shares of common stock and preferred stock of the Company. The Company is a party to an intellectual property license agreement with Novartis. In addition, NIBR is a preferred stock shareholder of the Company (see Note 6). Aggregate payments for the above related party transactions totaled $2.5 million, $0, and $0.9 million for the years ended December 31, 2019, 2018 and 2017, respectively. The Company is a party to a Funding Agreement with the Silverstein Foundation, an entity in which one of the Company’s directors is a co-founder and current trustee (See Note 7). No funds were received from the Silverstein Foundation during the year ended December 31, 2019 and 2017. The Company received $0.5 million during the year ended December 31, 2018.

Related Party Transactions

12 Months Ended

Dec. 31, 2019

14. Related Party Transactions

Since the Company’s incorporation in July 2016, the Company has engaged in transactions with related parties.

During the year ended December 31, 2017, the Company issued 1,886,363 shares of common stock and made payments to PureTech for certain founding services and cost reimbursements. PureTech is a founder of the Company and holds shares of common stock and preferred stock of the Company.

The Company is a party to an intellectual property license agreement with Novartis. In addition, NIBR is a preferred stock shareholder of the Company (see Note 6).

Aggregate payments for the above related party transactions totaled $2.5 million, $0, and $0.9 million for the years ended December 31, 2019, 2018 and 2017, respectively.

The Company is a party to a Funding Agreement with the Silverstein Foundation, an entity in which one of the Company’s directors is a co-founder and current trustee (See Note 7). No funds were received from the Silverstein Foundation during the year ended December 31, 2019 and 2017. The Company received $0.5 million during the year ended December 31, 2018.