Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Schedule of Non-Controlling Interest in Subsidiary

The Company’s ownership of Silver Creek was 64% as of March 31, 2014 and December 31, 2013. The consolidated financial statement activity related to Silver Creek was as follows:


(in thousands)	Non-Controlling Interest (Deficit)
Balance at December 31, 2012	$	97
Net loss attributable to Silver Creek		(170	)

Balance at March 31, 2013	$	(73	)


	Non-Controlling Interest
Balance at December 31, 2013	$	337
Net loss attributable to Silver Creek		(169	)

Balance at March 31, 2014	$	168

Schedule of Available-for-Sale Securities, All of Which Have Maturities of Twelve Months or Less

Available-for-sale securities, all of which have maturities of twelve months or less, as of March 31, 2014 consisted of the following:


	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
March 31, 2014:
Commercial paper	$	26,796	$	1	$	(1	)	$	26,796
Corporate debt securities		30,491		—		(8	)		30,483


Total	$	57,287	$	1	$	(9	)	$	57,279

Schedule of Available-for-Sale Securities in Unrealized Loss Position

Available-for-sale securities in an unrealized loss position as of March 31, 2014 consisted of the following:


	Aggregate Fair Value		Unrealized Losses
	(in thousands)
March 31, 2014:
Commercial paper	$	7,098	$	(1	)
Corporate debt securities		30,483		(8	)

	$	37,581	$	(9	)