Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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

During the years ended December 31, 2020, 2019, and 2018, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss and potentially dilutive shares being anti-dilutive of basic and diluted net loss per share attributable to common stockholders of the Company for the years ended December 31, 2020, 2019, and 2018:

In thousands, except for net loss per share	2020			2019			2018
Net loss	$	(57,949	)	$	(23,557	)	$	(16,491	)
Convertible preferred stock deemed dividend, net of return from holders		—			—			(932	)
Accretion of redeemable series A-1 preferred stock		(17,601	)		(19,616	)		(3,605	)
Redeemable series A-1 preferred stock deemed dividend		(24,341	)		—			—
Convertible and redeemable series A-2 preferred stock dividend		(6,970	)		—			—
Net loss attributable to common stockholders – basic and diluted		(106,861	)		(43,173	)		(21,028	)
Weighted-average common shares outstanding – basic and diluted		16,479			8,789			7,533
Net loss per share attributable to common stockholders – basic and diluted	$	(6.48	)	$	(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 years ended December 31, 2020, 2019 and 2018:

	2020		2019		2018
Stock options		2,237,910		2,048,738		1,321,890
Restricted stock		187,989		153,352		112,637
Warrants		116,350		116,350		108,267