Net Loss per Common Share (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Basic and Diluted Net Loss per Common Share

The following table presents the calculation of basic and diluted net loss per common share:

	Year Ended December 31,
	2017			2018			2019
Numerator:
Net loss	$	(51,006,094	)	$	(127,502,194	)	$	(304,706,613	)
Denominator:
Weighted-average number of common shares used in net loss per common share -- basic and diluted		13,870,949			54,396,483			62,228,601
Net loss per common share -- basic and diluted	$	(3.68	)	$	(2.34	)	$	(4.90	)

Summary of Shares Outstanding that were Excluded from Calculation of Diluted Net Loss Per Share

Shares outstanding presented below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, as their effect is anti-dilutive:

	Year Ended December 31,
	2017		2018		2019
Common stock under option		6,355,581		7,497,734		10,854,437
Common stock warrants		14,064		14,064		—
Total		6,369,645		7,511,798		10,854,437