Available-for-sale Securities (Tables)

3 Months Ended

Mar. 31, 2016

Summary of Available for Sale Securities

The following is a summary of available-for-sale securities at March 31, 2016 (in thousands):


	March 31, 2016
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	6,648	$	—	$	—		$	6,648
United States government agency securities		9,996		1		—			9,997
Corporate debt securities		60,465		72		(21	)		60,516
Marketable equity securities		—		5,082		—			5,082

Total available-for-sale securities	$	77,109	$	5,155	$	(21	)	$	82,243

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


	December 31, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized 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	$	11,163	$	(49	)	$	96,163

Available for Sale Debt Securities by Original Contractual Maturity

Available-for-sale securities at March 31, 2016 and December 31, 2015, consisted of the following by contractual maturity (in thousands):


	March 31, 2016				December 31, 2015
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	56,934	$	56,934	$	85,049	$	85,000
Marketable equity securities		—		5,082		—		11,163
Greater than one year and less than five years		20,175		20,227		—		—

Total available-for-sale securities	$	77,109	$	82,243	$	85,049	$	96,163

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):


	March 31, 2016
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	18,137	$	(21	)	$	—	$	—		$	18,137	$	(21	)

Total available-for-sale securities	$	18,137	$	(21	)	$	—	$	—		$	18,137	$	(21	)


	December 31, 2015
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	20,170	$	(46	)	$	5,528	$	(3	)	$	25,698	$	(49	)

Total available-for-sale securities	$	20,170	$	(46	)	$	5,528	$	(3	)	$	25,698	$	(49	)