Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (unaudited)The following table contains selected quarterly financial information for 2020 and 2019. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.

	Three months ended
	March 31, 2020		June 30, 2020		September 30, 2020		December 31, 2020
Collaboration revenue	$	11	$	796	$	11	$	10
Operating expenses:
Research and development	12,219		15,413		16,546		22,858
General and administrative	4,936		5,171		5,881		5,914
Total operating expenses	17,155		20,584		22,427		28,772
Other income:
Interest income	306		89		19		10
Interest expense	(88)		(87)		(92)		(92)
Total other income (expense), net	218		2		(73)		(82)
Net loss	$	(16,926)	$	(19,786)	$	(22,489)	$	(28,844)
Net loss per share attributable to common stockholders — basic and diluted	$	(0.35)	$	(0.33)	$	(0.33)	$	(0.42)
Weighted-average number of common shares used in net loss per share attributable to common stockholders — basic and diluted	47,988,630		60,748,225		68,419,192		68,630,078

	Three months ended
	March 31, 2019		June 30, 2019		September 30, 2019		December 31, 2019
Collaboration revenue	$	41,035	$	202	$	844	$	42
Operating expenses:
Research and development	15,143		13,766		13,701		12,430
General and administrative	4,443		4,192		4,436		4,212
Total operating expenses	19,586		17,958		18,137		16,642
Other income:
Interest income	452		725		608		441
Interest expense	—		(40)		(107)		(87)
Total other income (expense), net	452		685		501		354
Net income (loss)	$	21,901	$	(17,071)	$	(16,792)	$	(16,246)
Net income (loss) per share attributable to common stockholders — basic	$	0.72	$	(0.36)	$	(0.35)	$	(0.34)
Net income (loss) per share attributable to common stockholders — diluted	$	0.70	$	(0.36)	$	(0.35)	$	(0.34)
Weighted-average number of common shares used in net income (loss) per share attributable to common stockholders — basic	30,299,650		47,708,085		47,833,607		47,886,144
Weighted-average number of common shares used in net income (loss) per share attributable to common stockholders — diluted	31,461,696		47,708,085		47,833,607		47,886,144