Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Measurements

Schedule of assets measured on a recurring basis at fair value

	Level 1		Level 2		Level 3		Total
	(in thousands)
December 31, 2019
Cash equivalents
Certificate of deposits and time deposits	$	67,009	$	—	$	—	$	67,009
Commercial paper		—		10,484		—		10,484
Corporate debt		—		1,000		—		1,000
Total	$	67,009	$	11,484	$	—	$	78,493
Short-term investments
U.S. treasuries	$	105,130	$	—	$	—	$	105,130
Government agency securities		—		1,139		—		1,139
Corporate debt		—		6,002		—		6,002
Commercial paper		—		2,981		—		2,981
Total	$	105,130	$	10,122	$	—	$	115,252
December 31, 2018
Cash equivalents
Certificate of deposits and time deposits	$	65,571	$	—	$	—	$	65,571
U.S. treasuries		3,990		—		—		3,990
Total	$	69,561	$	—	$	—	$	69,561
Short-term investments
U.S. treasuries	$	37,184	$	—	$	—	$	37,184
Corporate debt		—		8,516		—		8,516
Commercial paper		—		2,489		—		2,489
Total	$	37,184	$	11,005	$	—	$	48,189