Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping

	Assets and Liabilities at Fair Value
	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	36,112	$	—	$	—	$	36,112
Short-term investments	235,547		—		—		235,547
Total cash and cash equivalents and investments	$	271,659	$	—	$	—	$	271,659

	Assets and Liabilities at Fair Value
	As of December 31, 2018
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	80,386	$	—	$	—	$	80,386
Short-term investments	73,974		5,692		—		79,666
Total cash and cash equivalents and investments	$	154,360	$	5,692	$	—	$	160,052