Marketable Securities

12 Months Ended

Dec. 31, 2012

Marketable Securities

Marketable Securities

5. Marketable Securities

        Available-for-sale marketable securities and cash and cash equivalents consist of the following (in thousands):

	December 31, 2012
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Cash and cash equivalents:
Cash	$	1,134	$	—	$	—	$	1,134
Money market		16,020		—		—		16,020
Domestic corporate commercial paper		1,499		—		—		1,499
Total	$	18,653	$	—	$	—	$	18,653
Marketable securities:
Domestic corporate commercial paper		4,000		—		—		4,000
Total	$	4,000	$	—	$	—	$	4,000

	December 31, 2011
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	5,003	$	—	$	—		$	5,003
Money market		20,125		—		—			20,125
Total	$	25,128	$	—	$	—		$	25,128
Marketable securities:
Domestic corporate debt securities		10,260		—		(6	)		10,254
Domestic corporate commercial paper		18,987		11		—			18,998
U.S. government securities		2,328		—		—			2,328
Total	$	31,575	$	11	$	(6	)	$	31,580

        There were no debt securities that had been in an unrealized loss position for more than 12 months as of December 31, 2012 or December 31, 2011. There were no debt securities in an unrealized loss position for less than 12 months at December 31, 2012 and there were 7 debt securities that had been in an unrealized loss position for less than 12 months at December 31, 2011. The aggregate unrealized loss on these securities as of December 31, 2011 was $6.0 thousand and the fair value was $8.0 million. The Company considered the decline in market value for these securities to be primarily attributable to current economic conditions. As it was not more likely than not that the Company would be required to sell these securities before the recovery of their amortized cost basis, which may be maturity, the Company did not consider these investments to be other-than-temporarily impaired as of December 31, 2011.