Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Summary of valuation of the Company's investments and financial instruments that are measured at fair value on a recurring basis

The following table summarizes the valuation of the Company’s financial instruments that are measured at fair value on a recurring basis:

	September 30, 2020								December 31, 2019
			Fair value measurement category								Fair value measurement category
(In thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	28,059	$	28,059	$	—	$	—	$	5,381	$	5,381	$	—	$	—
Commercial paper	9,984		—		9,984		—		11,892		—		11,892		—
Corporate notes	11,186		—		11,186		—		18,380		—		18,380		—
U.S. government securities	13,804		—		13,804		—		11,295		—		11,295		—
U.S. government agency bonds	3,499		—		3,499		—		—		—		—		—
U.S. asset-backed securities	3,562		—		3,562		—		10,509		—		10,509		—
	$	70,094	$	28,059	$	42,035	$	—	$	57,457	$	5,381	$	52,076	$	—