Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	March 31, 2020								December 31, 2019
	Level I		Level II		Level III		Total		Level I		Level II		Level III		Total
	(in thousands)
Financial Assets:
Money market deposits	$	35,818	$	—	$	—	$	35,818	$	22,477	$	—	$	—	$	22,477
U.S. Treasury securities		249,314		—		—		249,314		293,157		—		—		293,157
Municipal securities		—		82,367		—		82,367		—		85,908		—		85,908
Total financial assets	$	285,132	$	82,367	$	—	$	367,499	$	315,634	$	85,908	$	—	$	401,542