Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was classified in the Company’s condensed consolidated statement of operations and comprehensive loss as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Stock-based compensation expense:
Research and development	$	1,940	$	159	$	3,111	$	275
General and administrative		3,288		2		5,962		2
Total stock-based compensation expense	$	5,228	$	161	$	9,073	$	277

Summary of Stock Option Activity

The following table summarizes the stock option activity under the Company’s equity awards plans for the six months ended June 30, 2021:

	Number of Stock Options			Weighted-Average Exercise Price
Outstanding as of December 31, 2020		5,029,364		$	12.72
Granted		1,400,904			42.25
Exercised		(175,478	)		4.04
Cancelled or forfeited		(104,224	)		24.57
Outstanding as of June 30, 2021		6,150,566		$	19.50
Options exercisable as of June 30, 2021		971,796		$	12.74
Vested and expected to vest as of June 30, 2021		6,150,566		$	19.50