Net Loss Per Share - Summary of Calculation of Diluted Shares Outstanding (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Potentially dilutive shares not included in calculation of diluted shares outstanding	11,706,560	77,375,378
Redeemable Convertible Preferred Stock
Potentially dilutive shares not included in calculation of diluted shares outstanding		66,825,300
Warrants
Potentially dilutive shares not included in calculation of diluted shares outstanding		161,136
Stock Options
Potentially dilutive shares not included in calculation of diluted shares outstanding	6,251,226	6,144,500
Restricted Stock Awards
Potentially dilutive shares not included in calculation of diluted shares outstanding	3,249,382	3,836,442
Restricted Stock Units
Potentially dilutive shares not included in calculation of diluted shares outstanding	2,205,952	408,000