Related Party Transactions	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	14. Related Party Transactions One of the founders (“Founder”), a non-employee member of the Company’s board of directors, entered into a consulting agreement with the Company in 2014 under which the Founder would receive $50,000 per year for a fixed number of hours of consulting and advisory services and receive equity incentive shares, which converted into 43,290 restricted stock awards and 13,852 stock options upon the LLC Conversion, with the vesting contingent on time and performance milestones being achieved. Effective November 7, 2018, the Founder resigned from his position as a member of the Company’s board of directors and is no longer deemed a related party. Upon resigning, the board of directors approved the immediate vesting of all unvested stock options and restricted stock. Additionally, the exercise period was extended from 90 days to 180 days. The acceleration of vesting and extension of the exercise period resulted in additional stock-based compensation expense (see Note 9). For the year ended December 31, 2018, there were no payments made to the Founder under the consulting agreement. In each of the years ended December 31, 2017 and 2016, the Company paid $50,000 to the Founder under the consulting agreement. As of December 31, 2018 and 2017, the Company had no outstanding liability to the related party.

Related Party Transactions

12 Months Ended

Dec. 31, 2018

14. Related Party Transactions

One of the founders (“Founder”), a non-employee member of the Company’s board of directors, entered into a consulting agreement with the Company in 2014 under which the Founder would receive $50,000 per year for a fixed number of hours of consulting and advisory services and receive equity incentive shares, which converted into 43,290 restricted stock awards and 13,852 stock options upon the LLC Conversion, with the vesting contingent on time and performance milestones being achieved.

Effective November 7, 2018, the Founder resigned from his position as a member of the Company’s board of directors and is no longer deemed a related party. Upon resigning, the board of directors approved the immediate vesting of all unvested stock options and restricted stock. Additionally, the exercise period was extended from 90 days to 180 days. The acceleration of vesting and extension of the exercise period resulted in additional stock-based compensation expense (see Note 9).

For the year ended December 31, 2018, there were no payments made to the Founder under the consulting agreement. In each of the years ended December 31, 2017 and 2016, the Company paid $50,000 to the Founder under the consulting agreement. As of December 31, 2018 and 2017, the Company had no outstanding liability to the related party.