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Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Cash equivalents and marketable securities consisted of the following at December 31, 2020 (in thousands):


			Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
December 31, 2020	Cost		Losses		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	139,682	$	—	$	—	$	—	$	139,682
U.S. Treasuries		180,376		—		8		(11)		180,373
Government agency securities		107,665		—		—		(20)		107,645
Commercial paper		41,912		—		—		(8)		41,904
Corporate notes/bonds		42,185		—		10		(25)		42,170
Total	$	511,820	$	—	$	18	$	(64)	$	511,774

Cash equivalents and marketable securities consisted of the following at December 31, 2019 (in thousands):


			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
December 31, 2019	Cost		Gains		Losses		Value
Cash equivalents and marketable securities:
Money market funds	$	230,201	$	—	$	—	$	230,201
U.S. Treasuries		71,348		20		—		71,368
Government agency securities		155,484		87		—		155,571
Equity securities included in other non-current assets:
Corporate equity securities		3,667		—		—		3,667
Total	$	460,700	$	107	$	—	$	460,807