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Cash, Money Market Funds and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

Cash, Money Market Funds and Marketable Securities

Schedule of cash and available-for-sale securities

Cash and available for sale securities consisted of the following as of December 31, 2016 and December 31, 2015 (in thousands):

		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

		As of December 31, 2015
		Cost			Unrealized Gain			Unrealized Loss			Fair Value
Cash balances		$	69,485		$	—		$	—		$	69,485
Corporate debt securities, current portion			118,627			1			(154	)		118,474
Commercial paper			25,686			38			—			25,724
Certificate of deposit			350			—			—			350

		$	214,148		$	39		$	(154	)	$	214,033


Included in cash and cash equivalents		$	69,485		$	—		$	—		$	69,485
Included in marketable securities			144,663			39			(154	)		144,548

Total cash and marketable securities		$	214,148			39		$	(154	)	$	214,033