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

	As of March 31, 2017
	Cost		Gross unrealized Gain		Gross unrealized Loss			Fair Value
Cash balances	$	44,755	$	—	$	—		$	44,755
Corporate debt securities, current portion	124,061		5		(38		)	124,028
Commercial paper	110,441		218		—			110,659
Money market	350		—		—			350
Certificate of deposit	50		—		—			50

	$	279,657	$	223	$	(38	)	$	279,842

Included in cash and cash equivalents	$	44,755	$	—	$	—		$	44,755
Included in marketable securities	234,902		223		(38		)	235,087

Total cash and marketable securities	$	279,657	223		$	(38	)	$	279,842

	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