Net Loss per Share (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company for the three and nine months ended September 30, 2020 and September 30, 2019:

	Three Months Ended September 30,						Nine Months Ended September 30,
In thousands, except for net loss per share	2020			2019			2020			2019
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
Accretion of redeemable series A-1 preferred stock		(6,542	)		(5,030	)		(17,601	)		(14,341	)
Redeemable series A-1 preferred stock deemed dividend		(24,341	)		—			(24,341	)		—
Convertible and redeemable series A-2 preferred stock dividend		(2,870	)		—			(2,870	)		—
Net loss attributable to common stockholders—basic and diluted		(64,490	)		(11,713	)		(103,573	)		(26,588	)
Weighted-average common shares outstanding—basic and diluted		21,554			8,718			13,669			8,640
Net loss per share attributable to common stockholders—basic and diluted	$	(2.99	)	$	(1.34	)	$	(7.58	)	$	(3.08	)

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company for the years ended December 31, 2019 and 2018:

In thousands, except for net loss per share	2019			2018
Net loss	$	(23,557	)	$	(16,491	)
Convertible preferred stock deemed dividend, net of return from holders					(932	)
Accretion of redeemable series A- 1 preferred stock		(19,616	)		(3,605	)
Net loss attributable to common stockholders—basic and diluted		(43,173	)		(21,028	)
Weighted- average common shares outstanding—basic and diluted		8,789			7,533
Net loss per share attributable to common stockholders—basic and diluted	$	(4.91	)	$	(2.79	)

Equity Shares Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders

The following equity shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the three and nine months ended September 30, 2020 and September 30, 2019:

	September 30,
	2020		2019
Stock options		2,423,900		2,062,825
Restricted stock		176,384		158,426
Warrants		116,350		116,350

The following equity shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the years ended December 31, 2019 and 2018:

	2019		2018
Stock options		2,048,738		1,321,890
Restricted stock		153,352		112,637
Warrants		116,350		108,267