Available-for-sale Securities (Tables)

6 Months Ended

Jun. 30, 2015

Summary of Available for Sale Securities

The following is a summary of available-for-sale securities at June 30, 2015 (in thousands):


	June 30, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	18,588	$	—	$	—		$	18,588
United States government agency securities		61,995		9		—			62,004
Corporate debt securities		13,858		—		(8	)		13,850
Aduro equity securities		—		12,032		—			12,032

Total available-for-sale securities	$	94,441	$	12,041	$	(8	)	$	106,474

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 Original Contractual Maturity

Available-for-sale debt securities at June 30, 2015 and December 31, 2014, consisted of the following by original contractual maturity (in thousands):


	June 30, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	94,441	$	94,442	$	27,752	$	27,727
Greater than one year and less than five years		—		—		5,705		5,699

Total available-for-sale debt securities	$	94,441	$	94,442	$	33,457	$	33,426