Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of assets measured at fair value on recurring basis

The following tables summarize assets that are measured at fair value on a recurring basis:

	December 31, 2019
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents
Money market funds	$	13,588	$	—	$	—	$	13,588
Commercial paper	—		8,987		—		8,987
	$	13,588	$	8,987	$	—	$	22,575
Short-term investments
Commercial paper	$	—	$	61,371	$	—	$	61,371
Corporate bonds	—		23,869		—		23,869
U.S. Treasury and agency obligations	—		52,664		—		52,664
	$	—	$	137,904	$	—	$	137,904

	December 31, 2018
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents
Money market funds	$	38,022	$	—	$	—	$	38,022
	$	38,022	$	—	$	—	$	38,022
Short-term investments
Commercial paper	$	—	$	79,634	$	—	$	79,634
Corporate bonds	—		16,119		—		16,119
U.S. Treasury and agency obligations	—		22,366		—		22,366
	$	—	$	118,119	$	—	$	118,119