Cash and Investments

12 Months Ended

Dec. 31, 2012

Cash and Investments [Abstract]

Cash and Investments

2. Cash and Investments

Cash, cash equivalents, short-term investments, long-term investments and restricted cash consist of the following (in thousands):

	December 31,
	2012		2011
Cash	$	2,590	$	1,428
Cash and cash equivalents:
Corporate debt		—		501
Money market funds		7,313		6,576
Total cash equivalents		7,313		7,077
Total cash and cash equivalents		9,903		8,505
Short-term investments:
U.S. agency securities		—		1,751
Municipal securities		356		355
Corporate commercial paper		4,374		1,250
Foreign government bonds		999		500
Corporate debt securities		4,097		5,763
Total short-term investments		9,826		9,619
Restricted cash—money market fund		875		875
Total cash, cash equivalents, investments and restricted cash	$	20,604	$	18,999

Gross unrealized gains and losses on our cash equivalents and short-term investments were not material as of December 31, 2012 and December 31, 2011. Our restricted cash balance at December 31, 2012 and 2011 relates to a letter of credit which will continue to secure our corporate headquarters lease obligation to its expiration in 2014.