Short-term Investments (Tables)

9 Months Ended

Sep. 30, 2019

Short-term Investment

Summary of amortized cost and estimated fair value of Company’s marketable securities

	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(inthousands)
Balance as of September 30, 2019:
U.S. government-sponsored enterprise securities	$	6,091	$	3	$	—	$	6,094
U.S. Treasury securities		27,396		19		—		27,415
Total	$	33,487	$	22	$	—	$	33,509

	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(inthousands)
Balance as of December 31, 2018:
U.S. government-sponsored enterprise securities	$	6,059	$	—	$	—	$	6,059
U.S. Treasury securities		29,680		—		(7)		29,673
Total	$	35,739	$	—	$	(7)	$	35,732