Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	December 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	$	283,358	$	—	$	—	$	283,358	$	10,041	$	—	$	—	$	10,041
Liquid demand deposits		125,596		—		—		125,596		—		—		—		—
U.S. Treasury securities		346,057		—		—		346,057		688,097		—		—		688,097
Corporate bonds and notes		—		23,529		—		23,529		—		52,337		—		52,337
Municipal securities		—		62,715		—		62,715		—		89,462		—		89,462
Total financial assets	$	755,011	$	86,244	$	—	$	841,255	$	698,138	$	141,799	$	—	$	839,937