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Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Cash Equivalents And Marketable Securities [Abstract]

Schedule of Cash Equivalent and Marketable Securities Classified as Available-for-Sale

Cash equivalents and marketable securities classified as available-for-sale consisted of the following:


		September 30, 2021
		Amortized Cost Basis				Unrealized Gains				Unrealized Losses				Estimated Fair Value
		(in thousands)
Cash equivalents:
Money market funds		$	69,644			$	—			$	—			$	69,644
Short-term marketable securities:
U.S. treasury notes			60,526				29				—				60,555
Commercial paper			184,273				7				(3	)			184,277
Corporate debt securities			134,365				10				(24	)			134,351
Supranational debt securities			40,081				1				(1	)			40,081
Total short-term marketable securities			419,245				47				(28	)			419,264
Total cash equivalents and marketable securities		$	488,889			$	47			$	(28	)		$	488,908


		December 31, 2020
		Amortized Cost Basis				Unrealized Gains				Unrealized Losses				Estimated Fair Value
		(in thousands)
Cash equivalents:
Money market funds		$	266,437			$	—			$	—			$	266,437
Short-term marketable securities:
U.S. treasury bills			14,996				3				—				14,999
U.S. treasury notes			45,292				100				(1	)			45,391
Commercial paper			144,851				—				—				144,851
Corporate debt securities			45,680				93				(3	)			45,770
Total short-term marketable securities			250,819				196				(4	)			251,011
Total cash equivalents and marketable securities		$	517,256			$	196			$	(4	)		$	517,448