Available-for-sale Securities (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Available for Sale Securities

The following is a summary of available-for-sale securities at December 31, 2015 (in thousands):

	December 31, 2015
	Amortized Cost		Gross Unrealized Gain (Loss)			Fair Value
Money market funds	$	59,302	$	—		$	59,302
Corporate debt securities		25,747		(49	)		25,698
Marketable equity securities		—		11,163			11,163
Total available-for-sale securities	$	85,049	$	11,114		$	96,163

The following is a summary of available-for-sale securities at December 31, 2014 (in thousands):

	December 31, 2014
	Amortized Cost		Gross Unrealized Loss			Fair Value
Money market funds	$	3,912	$	—		$	3,912
United States government agency securities		3,427		(1	)		3,426
Corporate debt securities		26,118		(30	)		26,088
Total available-for-sale securities	$	33,457	$	(31	)	$	33,426

Available for Sale Debt Securities by Contractual Maturity

Available-for-sale securities at December 31, 2015 and 2014, consisted of the following by contractual maturity (in thousands):

	December 31, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	85,049	$	85,000	$	27,752	$	27,727
Marketable equity securities		—		11,163		—		—
Greater than one year and less than five years		—		—		5,705		5,699
Total available-for-sale securities	$	85,049	$	96,163	$	33,457	$	33,426

Available for Sale Marketable Securities in Unrealized Position

The following tables show all available-for-sale marketable securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	December 31, 2015
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Money market funds	$	—	$	—		$	—	$	—		$	—	$	—
Corporate debt securities		20,170		(46	)		5,528		(3	)		25,698		(49	)
Marketable equity securities		—		—			—		—			—		—
Total available-for-sale securities	$	20,170	$	(46	)	$	5,528	$	(3	)	$	25,698	$	(49	)
	December 31, 2014
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Money market funds	$	—	$	—		$	—	$	—		$	—	$	—
United States government agency securities		3,426		(1	)		—		—			3,426		(1	)
Corporate debt securities		22,169		(30	)		—		—			22,169		(30	)
Total available-for-sale securities	$	25,595	$	(31	)	$	—	$	—		$	25,595	$	(31	)