Fair value measurement (Tables)

6 Months Ended

Jun. 30, 2020

Fair value measurement

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

At June 30, 2020	Level 1		Level 2		Level 3		Total
Assets:
Money market accounts	$	136,741	$	—	$	—	$	136,741
Marketable securities		2,013		18,087		—		20,100
Total assets	$	138,754	$	18,087	$	—	$	156,841

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