Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value of Financial Instruments

Schedule of assets that were accounted for at fair value on recurring basis

	September 30, 2019
	Fair Value Measurement Using
	Level 1		Level 2		Level 3		Total
	(inthousands)
Cash equivalents:
Money market funds	$	13,146	$	—	$	—	$	13,146
Short-term investments:
U.S. government-sponsored enterprise securities		—		6,094		—		6,094
U.S. Treasury securities		27,415		—		—		27,415
Total	$	40,561	$	6,094	$	—	$	46,655

	December 31, 2018
	Fair Value Measurement Using
	Level 1		Level 2		Level 3		Total
	(inthousands)
Cash equivalents:
Money market funds	$	18,609	$	—	$	—	$	18,609
U.S. Treasury securities		19,964		—		—		19,964
Short-term investments:
U.S. government-sponsored enterprise securities		—		6,059		—		6,059
U.S. Treasury securities		29,673		—		—		29,673
Total	$	68,246	$	6,059	$	—	$	74,305