Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	March 31, 2022								December 31, 2021
	Level I		Level II		Level III		Total		Level I		Level II		Level III		Total
	(in thousands)
Financial Assets:
Money market deposits	$	56,374	$	—	$	—	$	56,374	$	10,041	$	—	$	—	$	10,041
U.S. Treasury securities		474,849		—		—		474,849		688,097		—		—		688,097
Corporate bonds and notes		—		45,666		—		45,666		—		52,337		—		52,337
Municipal securities		—		73,145		—		73,145		—		89,462		—		89,462
Total financial assets	$	531,223	$	118,811	$	—	$	650,034	$	698,138	$	141,799	$	—	$	839,937