Fair value measurement (Tables)

3 Months Ended

Mar. 31, 2020

Fair value measurement

Schedule of financial assets and liabilities that are measured at fair value on a recurring basis

At March 31, 2020	Level 1		Level 2		Level 3		Total
Assets:
Money market accounts	$	141,204	$	—	$	—	$	141,204
Marketable securities		3,776		25,525		—		29,301
Total assets	$	144,980	$	25,525	$	—	$	170,505

At December 31, 2019	Level 1		Level 2		Level 3		Total
Assets:
Money market accounts	$	32,843	$	1,497	$	—	$	34,340
Marketable securities		6,262		33,952		—		40,214
Total assets	$	39,105	$	35,449	$	—	$	74,554