Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair value measurements

Summary of fair value of assets and liabilities on a recurring basis based on fair value measurement criteria

Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of March 31, 2020 are as follows (in thousands):

			Fair value measurements using
	March 31,		Level 1		Level 2		Level 3
	2020
Assets:
Corporate debt securities	$	108,002	$	108,002		—		—
Treasury bills		1,998		—		1,998		—
	$	110,000	$	108,002	$	1,998	$	—