Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2020

Computation of Company's Basic and Diluted Net Loss Per Share

The following table sets forth the computation of the Company’s basic and diluted net loss per share for the periods presented (in thousands, except share and per share data):

	Year Ended December 31,
	2020			2019			2018
Net loss attributable to common stockholders, basic and diluted	$	(107,908	)	$	(120,199	)	$	(79,124	)
Weighted-average common shares used in computing net loss per share, basic and diluted		147,895,561			102,001,954			81,123,140
Net loss per share, basic and diluted	$	(0.73	)	$	(1.18	)	$	(0.98	)

Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share

The following table sets forth securities outstanding that could potentially dilute the calculation of diluted earnings per share:

	Year Ended December 31,
	2020		2019		2018
Options to purchase common stock		8,142,348		11,165,846		11,603,708
Warrants to purchase common stock - liability classified		2,156,153		2,156,153		2,840,147
Warrants to purchase common stock - equity classified		1,418,116		1,457,866		1,586,097
Unvested restricted stock units		8,046,399		4,379,777		1,736,234