Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	September 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	$	496	$	—	$	—	$	496	$	10,041	$	—	$	—	$	10,041
U.S. Treasury securities		378,108		—		—		378,108		688,097		—		—		688,097
Corporate bonds and notes		—		23,374		—		23,374		—		52,337		—		52,337
Municipal securities		—		62,630		—		62,630		—		89,462		—		89,462
Total financial assets	$	378,604	$	86,004	$	—	$	464,608	$	698,138	$	141,799	$	—	$	839,937