Summary of Significant Accounting Policies - Net Loss Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss attributable to common shareholders	$ (7,397,076)	$ (4,131,363)	$ (11,491,698)	$ (8,310,463)
Net loss used for basic and diluted loss per share	$ (7,397,076)	$ (4,131,363)	$ (11,491,698)	$ (8,310,463)
Denominator:
Weighted-average shares used to compute basic and diluted net loss per share (in shares)	14,492,159	5,408,124	12,201,232	4,750,993
Net loss per share attributable to common stockholders:
Basic and diluted (in dollars per share)	$ (0.51)	$ (0.76)	$ (0.94)	$ (1.75)