Note 5. Available-for-sale Securities

The following is a summary of available-for-sale securities at December 31, 2012 (in thousands):


	December 31, 2012
	Carrying Value		Gross Unrealized Gain		Fair Value
Money market funds	$	10,268	$	0	$	10,268

Total available-for-sale securities	$	10,268	$	0	$	10,268

The following is a summary of available-for-sale securities at December 31, 2011 (in thousands):


	December 31, 2011
	Carrying Value		Gross Unrealized Gain		Fair Value
Money market funds	$	8,683	$	0	$	8,683
United States government agency securities		287		0		287

Total available-for-sale securities	$	8,970	$	0	$	8,970

Available-for-sale securities at December 31, 2012 and 2011 consisted of the following by original contractual maturity (in thousands):


	December 31, 2012				December 31, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
Due in one year or less	$	10,268	$	10,268	$	8,683	$	8,683
Due greater than three years and less than five years		0		0		287		287

Total available-for-sale securities	$	10,268	$	10,268	$	8,970	$	8,970

The maturities of certain short-term investments were estimated primarily based upon assumed prepayment features and credit enhancement characteristics.

The Company recorded minimal gross realized gains from the sale or maturity of available-for-sale investments during the year ended December 31, 2011 and did not record any gross realized gains from the sale or maturity of available-for-sale investments during the years ended December 31, 2012 and 2010. The Company recorded minimal gross realized losses from the sale or maturity of available-for-sale investments during the year ended December 31, 2010 and did not record any gross realized losses during the years ended December 31, 2012 and 2011. The Company did not record losses on investments experiencing an other-than-temporary decline in fair value during the years ended December 31, 2012, 2011 and 2010.