Available-for-sale marketable securities and cash and cash equivalents as of September 30, 2017 and December 31, 2016 consist of the following (in thousands):



	September 30, 2017
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Cash and cash equivalents:
Cash	$	110,853	$	—	$	—	$	110,853
Money market funds	315,110		—		—		315,110
Domestic corporate debt securities	7,000		—		—		7,000
Domestic corporate commercial paper	13,975		—		—		13,975
Total	$	446,938	$	—	$	—	$	446,938

Marketable securities:
Domestic corporate debt securities	$	11,655	$	—	$	—	$	11,655
Domestic corporate commercial paper	9,487		2		—		9,489
Total	$	21,142	$	2	$	—	$	21,144



	December 31, 2016
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	77,443	$	—	$	—		$	77,443
Money market funds	173,631		—		—			173,631
Domestic corporate commercial paper	5,487		—		—			5,487
Domestic corporate debt securities	2,006		—		—			2,006
Total	$	258,567	$	—	$	—		$	258,567

Marketable securities:
Domestic corporate debt securities	$	19,317	$	—	$	(2	)	$	19,315
Domestic corporate commercial paper	31,852		78		—			31,930
Asset-backed securities	22,639		—		(4		)	22,635
Total	$	73,808	$	78	$	(6	)	$	73,880