Cash Equivalents and Short-term and Long-term Investments (Tables)

3 Months Ended

Mar. 31, 2020

Cash and Cash Equivalents [Abstract]

Available-for-sale securities with unrealized losses

The following is a summary of available-for-sale securities with unrealized losses as of March 31, 2020 (in thousands):

	Less than 12 months
	Fair Value		Unrealized Losses
Corporate obligations	$	50,840	$	(181	)
Total available-for sale securities in an unrealized loss position	$	50,840	$	(181	)

Available-for-sale securities

The following is a summary of cash, cash equivalents and available-for-sale securities as of March 31, 2020 and December 31, 2019 (in thousands):

	March 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash and cash equivalents due in 90 days or less	$	277,485	$	1	$	—		$	277,486
Available-for-sale securities:
Corporate obligations	97,260		56		(181		)	97,135
U.S. Treasury securities	32,545		147		—			32,692
Certificates of deposit	245		3		—			248
Mortgage and other asset backed securities	8,000		2		—			8,002
Total available-for-sale securities	$	138,050	$	208	$	(181	)	$	138,077
Total cash, cash equivalents and available-for-sale securities	$	415,535	$	209	$	(181	)	$	415,563

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash and cash equivalents due in 90 days or less	$	237,677	$	—	$	—		$	237,677
Available-for-sale securities:
Corporate obligations	124,676		219		(15		)	124,880
U.S. Treasury securities	78,230		98		(1		)	78,327
Certificates of deposit	490		3		—			493
Mortgage and other asset backed securities	12,476		5		(12		)	12,469
Total available-for-sale securities	$	215,872	$	325	$	(28	)	$	216,169
Total cash, cash equivalents and available-for-sale securities	$	453,549	$	325	$	(28	)	$	453,846