Related Party Transactions	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	15. Related Party Transactions *UHN* In connection with the Company’s entry into a license agreement with UHN (Note 11) on January 27, 2016, the Company issued UHN 4,800,000 shares of its common stock. As a result of the issuance of common stock, UHN owned 4.45% and 9.65% of the Company’s fully diluted equity as of December 31, 2018 and 2017, respectively. Upon the closing of the sale of shares of common stock in an IPO, if UHN’s fully-diluted percentage ownership of the Company is reduced within a range of specified percentages, then the Company is obligated to pay UHN an amount up to $2,000. See Note 3 for further discussion on the accounting treatment for this provision. For the years ended December 31, 2018 and 2017, the Company recognized $56 and $167, respectively, of research and development expense related to the license agreements with UHN. Refer to Note 11 for additional information regarding the UHN license agreements. The Company recorded research and development expenses of $0 and $3 related to participation on the scientific advisory board and consulting services performed by a member of the board who is affiliated with UHN during the years ended December 31, 2018 and 2017, respectively. As of December 31, 2018 and 2017, there was $0 and $10, respectively, included in accrued expenses on the Company’s consolidated balance sheet related to these services. *Others* For the years ended December 31, 2018 and 2017, the Company recorded expenses of $348 and $0, respectively, related to a sublease to rent lab space, provided by an entity affiliated with a member of the board. For the years ended December 31, 2018 and 2017, the Company recorded expenses of $40 and $86, respectively, related to consulting services provided by an entity affiliated with an officer of the Company and a member of the Board. The entity is also a shareholder of the Company and owned 0.46% and 1.00% of the Company’s fully diluted equity as of December 31, 2018 and 2017, respectively. For the year ended December 31, 2017, the Company recorded expenses of $15, related to services provided by an entity affiliated with a member of the Board and the use of office space. The lease was terminated in February 2017 and the services were no longer being provided as of December 31, 2017. In August 2017, the Company entered into a sub-lease agreement with an entity affiliated with the Company’s CEO. The executive resigned from the affiliated entity in September 2017. The Company recorded rent expense of $31 under this sub-lease agreement prior to such resignation for the two month period in 2017. See Note 14 for additional information on the terms of these sublease agreements.

15. Related Party Transactions

UHN

In connection with the Company’s entry into a license agreement with UHN (Note 11) on January 27, 2016, the Company issued UHN 4,800,000 shares of its common stock. As a result of the issuance of common stock, UHN owned 4.45% and 9.65% of the Company’s fully diluted equity as of December 31, 2018 and 2017, respectively. Upon the closing of the sale of shares of common stock in an IPO, if UHN’s fully-diluted percentage ownership of the Company is reduced within a range of specified percentages, then the Company is obligated to pay UHN an amount up to $2,000. See Note 3 for further discussion on the accounting treatment for this provision.

For the years ended December 31, 2018 and 2017, the Company recognized $56 and $167, respectively, of research and development expense related to the license agreements with UHN. Refer to Note 11 for additional information regarding the UHN license agreements.

The Company recorded research and development expenses of $0 and $3 related to participation on the scientific advisory board and consulting services performed by a member of the board who is affiliated with UHN during the years ended December 31, 2018 and 2017, respectively. As of December 31, 2018 and 2017, there was $0 and $10, respectively, included in accrued expenses on the Company’s consolidated balance sheet related to these services.

Others

For the years ended December 31, 2018 and 2017, the Company recorded expenses of $348 and $0, respectively, related to a sublease to rent lab space, provided by an entity affiliated with a member of the board.

For the years ended December 31, 2018 and 2017, the Company recorded expenses of $40 and $86, respectively, related to consulting services provided by an entity affiliated with an officer of the Company and a member of the Board. The entity is also a shareholder of the Company and owned 0.46% and 1.00% of the Company’s fully diluted equity as of December 31, 2018 and 2017, respectively.

For the year ended December 31, 2017, the Company recorded expenses of $15, related to services provided by an entity affiliated with a member of the Board and the use of office space. The lease was terminated in February 2017 and the services were no longer being provided as of December 31, 2017.

In August 2017, the Company entered into a sub-lease agreement with an entity affiliated with the Company’s CEO. The executive resigned from the affiliated entity in September 2017. The Company recorded rent expense of $31 under this sub-lease agreement prior to such resignation for the two month period in 2017.

See Note 14 for additional information on the terms of these sublease agreements.