Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

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:

	Year Ended December 31,
	2021			2020			2019
Numerator:
Net loss attributable to common stockholders	$	(65,578	)	$	(89,127	)	$	(70,279	)
Denominator:
Weighted average common shares outstanding, basic and diluted		91,702,866			79,789,220			56,649,220
Net loss per share attributable to common stockholders, basic and diluted	$	(0.72	)	$	(1.12	)	$	(1.24	)

Summary of Potential Common Shares Excluded from Calculation of Diluted Net Loss per Share

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	Year Ended December 31,
	2021		2020		2019
Stock options to purchase common stock		11,517,189		10,037,130		8,310,683
Unvested restricted stock units		734,755		6,500		130,000
Shares issuable under employee stock purchase plan		165,047		10,786		89,821
		12,416,991		10,054,416		8,530,504