Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Financial Assets And Liabilities Subject To Fair Value Measurements On Recurring Basis And Level Of Inputs Used In Such Measurements By Major Security Type

Financial assets and liabilities subject to fair value measurements on a recurring basis and the level of inputs used in such measurements by major security type as of March 31, 2020 and as of December 31, 2019 are presented in the following tables: 

	March 31, 2020
	Level 1		Level 2		Level 3		Fair Value
	(in thousands)
Financial Assets:
Money market funds (1)	$	113,143	$	—	$	—	$	113,143
Commercial paper	—		25,786		—		25,786
Corporate bonds	—		190,854		—		190,854
U.S. treasury securities	180,313		—		—		180,313
U.S. agency securities	—		29,192		—		29,192
Total financial assets	$	293,456	$	245,832	$	—	$	539,288

	December 31, 2019
	Level 1		Level 2		Level 3		Fair Value
	(in thousands)
Financial Assets:
Money market funds (1)	$	122,900	$	—	$	—	$	122,900
Corporate bonds	—		205,011		—		205,011
U.S. treasury securities	181,894		—		—		181,894
U.S. agency securities	—		25,824		—		25,824
Certificates of deposit	—		1,000		—		1,000
Total financial assets	$	304,794	$	231,835	$	—	$	536,629

(1)Included within cash and cash equivalents on the Company’s balance sheets