Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense for the three months ended March 31, 2021 and 2020 was classified in the Company’s condensed consolidated statement of operations and comprehensive loss as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Stock-based compensation expense:
Research and development	$	1,171	$	116
General and administrative		2,674		—
Total stock-based compensation expense	$	3,845	$	116

Summary of Stock Option Activity

The following table summarizes the stock option activity under the Company’s equity awards plans for the three months ended March 31, 2021:

	Number of Stock Options			Weighted-Average Exercise Price
Outstanding as of December 31, 2020		5,029,364		$	12.72
Granted		1,001,054			44.48
Exercised		(49,328	)		3.36
Cancelled or forfeited		(28,176	)		21.23
Outstanding as of March 31, 2021		5,952,914		$	18.10
Options exercisable as of March 31, 2021		531,248		$	4.47
Vested and expected to vest as of March 31, 2021		5,952,914		$	18.10