Cash and available-for-sale securities are all current unless mentioned otherwise and consisted of the following as of June 30, 2017 and December 31, 2016 (in thousands):

	As of June 30, 2017
	Cost		Gross unrealized Gain		Gross unrealized Loss			Fair Value
Cash balances	$	37,394	$	—	$	—		$	37,394
Corporate debt securities, current portion	108,683		1		(35		)	108,649
Commercial paper	80,724		65		—			80,789
Money market	350		—		—			350
Certificate of deposit	50		—		—			50

	$	227,201	$	66	$	(35	)	$	227,232

Included in cash and cash equivalents	$	37,394	$	—	$	—		$	37,394
Included in marketable securities	189,807		66		(35		)	189,838

Total cash and marketable securities	$	227,201	66		$	(35	)	$	227,232

	As of December 31, 2016
	Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash balances	$	187,026	$	—	$	—		$	187,026
Corporate debt securities, current portion	74,564		2		(31		)	74,535
Commercial paper	68,258		132		—			68,390
Money market	350		—		—			350
Certificate of deposit	50		—		—			50

	$	330,248	$	134	$	(31	)	$	330,351

Included in cash and cash equivalents	$	187,026	$	—	$	—		$	187,026
Included in marketable securities	143,222		134		(31		)	143,325

Total cash and marketable securities	$	330,248	134		$	(31	)	$	330,351