Available-for-sale Securities (Tables)

9 Months Ended

Sep. 30, 2015

Summary of Available for Sale Securities

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


	September 30, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	42,169	$	—	$	—		$	42,169
United States government agency securities		30,000		3		—			30,003
Corporate debt securities		18,973		3		(11	)		18,965
Aduro equity securities		—		7,684		—			7,684

Total available-for-sale securities	$	91,142	$	7,690	$	(11	)	$	98,821

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 September 30, 2015 and December 31, 2014, consisted of the following by original contractual maturity (in thousands):


	September 30, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	91,142	$	91,137	$	27,752	$	27,727
Greater than one year and less than five years		—		—		5,705		5,699

Total available-for-sale debt securities	$	91,142	$	91,137	$	33,457	$	33,426