Net Loss Per Share

6 Months Ended

Jun. 30, 2019

Note 12. Net Loss Per Share

A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net loss per share attributable to common stockholders is as follows (in thousands, except share and per share data):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Numerator
Net loss attributable to common stockholders	$	(26,875	)	$	(18,937	)	$	(53,452	)	$	(34,152	)
Denominator
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted		9,494,447			8,314,251			9,102,234			8,307,010
Net loss per share attributable to common stockholders, basic and diluted	$	(2.83	)	$	(2.28	)	$	(5.87	)	$	(4.11	)

The following securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented, because including them would have been anti-dilutive (on an as-converted basis):

	June 30,
	2019		2018
Convertible preferred stock		38,778,180		35,916,225
Redeemable convertible preferred stock		19,585,426		16,410,256
Options to purchase common stock		9,537,699		8,703,564
Warrants to purchase convertible preferred stock		103,563		103,563
Warrant to purchase common stock		—		67,974
Total		68,004,868		61,201,582