Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted net loss per share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:

	Year Ended December 31,
(in thousands, except per share data)	2019			2018			2017
Net loss attributable to common stockholders	$	(99,013	)	$	(73,955	)	$	(41,785	)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	96,014			53,669			22,211
Net loss per share attributable to common stockholders, basic and diluted	$	(1.03	)	$	(1.38	)	$	(1.88	)

Potentially dilutive securities

The following potentially dilutive securities have been excluded from the diluted per share calculations because they would have been antidilutive:

	Year Ended December 31,
(in thousands)	2019	2018	2017
Stock options	12,939	19,219	14,573
Restricted stock units	2,894	1,129	—
Restricted shares	495	890	1,583
Shares to be issued under the 2018 ESPP	278	320	—
Redeemable convertible preferred stock	—	—	55,386
Total	16,606	21,558	71,542