Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Measurements

Summary of fair value of the Company’s financial assets

	December 31, 2019
					Significant
			Quoted Prices in		Other
			Active Markets or		Observable		Significant
			Identical Assets		Inputs		Unobservable
(in thousands)	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market (Note 2)	$	19,341	$	19,341	$	—	$	—
Marketable securities:
U.S. treasury securities		4,991		—		4,991		—
Agency bonds		24,451		—		24,451		—
Corporate bonds		271,072		—		271,072		—
Total	$	319,855	$	19,341	$	300,514	$	—

	December 31, 2018
					Significant
			Quoted Prices in		Other
			Active Markets or		Observable		Significant
			Identical Assets		Inputs		Unobservable
(in thousands)	Total		(Level 1)		(Level 2)		(Level 3)
Cash equivalents:
Money market (Note 2)	$	5,000	$	5,000		—		—