Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Marketable Securities [Abstract]

Summary of Debt Securities, Available-for-sale

The following table summarizes the Company’s marketable debt securities, classified as available-for-sale:

	Fair Value Measurements as of December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
	(in thousands)
Marketable debt securities:
U.S. Treasury bills	$	287,699	$	1	$	(577	)	$	287,123
U.S. government agency bonds		55,576		—		(189	)		55,387
	$	343,275	$	1	$	(766	)	$	342,510

	Fair Value Measurements as of December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss		Fair Value
	(in thousands)
Marketable debt securities:
U.S. Treasury bills	$	131,927	$	12	$	—	$	131,939
U.S. government agency bonds		29,995		5		—		30,000
	$	161,922	$	17	$	—	$	161,939