Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Measurements

Summary of financial assets and liabilities measured on recurring basis

	September 30, 2019								December 31, 2018
	Level I		Level II		Level III		Total		Level I		Level II		Level III		Total
	(in thousands)
Financial Assets:
Money market deposits	$	5,666	$	—	$	—	$	5,666	$	26,539	$	—	$	—	$	26,539
U.S. Treasury securities		131,635		—		—		131,635		75,685		—		—		75,685
U.S. agency securities		—		7,000		—		7,000		—		12,891		—		12,891
Municipal securities		—		48,065		—		48,065		—		18,885		—		18,885
Total financial assets	$	137,301	$	55,065	$	—	$	192,366	$	102,224	$	31,776	$	—	$	134,000