Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	June 30, 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	$	40,268	$	—	$	—	$	40,268	$	10,041	$	—	$	—	$	10,041
U.S. Treasury securities		447,004		—		—		447,004		688,097		—		—		688,097
Corporate bonds and notes		—		33,441		—		33,441		—		52,337		—		52,337
Municipal securities		—		66,908		—		66,908		—		89,462		—		89,462
Total financial assets	$	487,272	$	100,349	$	—	$	587,621	$	698,138	$	141,799	$	—	$	839,937