Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 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	32,089	32,089	—	—	5,381	5,381	—	—
Repurchase agreements	—	—	—	—	—	—	—	—
Commercial paper	7,061	—	7,061	—	11,892	—	11,892	—
Corporate notes	14,422	—	14,422	—	18,380	—	18,380	—
U.S. government securities	7,889	—	7,889	—	11,295	—	11,295	—
U.S. asset-backed securities	8,306	—	8,306	—	10,509	—	10,509	—
	69,767	32,089	37,678	—	57,457	5,381	52,076	—