Investment Securities

9 Months Ended

Sep. 30, 2012

Investment Securities

4. Investment Securities

Investment securities, including investment securities available-for-sale and investment securities classified as cash equivalents, consisted of the following (in thousands):

	September 30, 2012
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Estimated Fair Value
	(unaudited)
Government sponsored enterprise securities	$	13,289	$	1	$	—		$	13,290
Corporate debt securities		3,003		—		—			3,003
	$	16,292	$	1	$	—		$	16,293
	December 31, 2011
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Estimated Fair Value
U.S. Treasury notes	$	1,516	$	—	$	—		$	1,516
Government sponsored enterprise securities		9,827		2		(1	)		9,828
Corporate debt securities		12,812		3		—			12,815
	$	24,155	$	5	$	(1	)	$	24,159