Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Basic and Diluted Net Loss per Share

Basic and diluted net loss per share was calculated as follows:


	Year Ended December 31,
(in thousands, except share and per share amounts)	2019		2018		2017
Numerator:
Net loss	$	(192,256)	$	(99,854)	$	(50,284)
Denominator:
Weighted average common shares outstanding—basic and diluted	42,869,058		35,390,480		16,792,179
Net loss per share—basic and diluted	$	(4.48)	$	(2.82)	$	(2.99)

Summary of Potential Dilutive Securities

The following potential dilutive securities, presented based on amounts outstanding at the end of each reporting period, have been excluded from the calculation of diluted net loss per share because including them would have had an anti-dilutive impact:


	As of December 31,
	2019	2018	2017
Options to purchase common stock	6,750,939	5,787,151	4,598,352
Unvested time-based restricted common stock units	99,500	25,000	—
Unvested performance-based restricted common stock units	57,400	—	—
Total	6,907,839	5,812,151	4,598,352