Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of calculation of basic and diluted net loss per share attributable to common stockholders

Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):


	Year ended December 31,
	2019		2018		2017
Numerator:
Net Loss	$	(163,458)		(89,195)		(43,847)
Accretion of Series A redeemable convertible preferred stock to redemption value		—		—		(656)
Net loss attributable to common stockholders	$	(163,458)	$	(89,195)	$	(44,503)

Denominator:
Weighted average common shares outstanding, basic and diluted		78,688,878		39,285,468		8,023,785
Net loss per share, basic and diluted	$	(2.08)	$	(2.27)	$	(5.55)

Schedule of dilutive securities excluded from computations of diluted weighted average shares outstanding


	Year ended December 31,
	2019	2018	2017
Convertible preferred stock (as converted to common stock)	—	—	43,933,006
Warrants to purchase convertible preferred stock (as converted to common stock)	—	—	135,567
Restricted common stock (1)	376,514	2,230,235	6,277,014
Stock options to purchase common stock	15,103,907	14,784,770	4,661,635
	15,480,421	17,015,005	55,007,222

Includes unvested restricted stock and, in 2018 and 2017, vested restricted stock issued for promissory notes.