Cash and Investments (Tables)

6 Months Ended

Jun. 30, 2012

Cash and Investments [Abstract]

Cash, cash equivalents, short-term investments, and restricted cash

	June 30, 2012		December 31, 2011
Cash	$	2,323	$	1,428
Cash equivalents:
Corporate debt		750		501
Money market funds		7,442		6,576
Total cash equivalents		8,192		7,077
Total cash and cash equivalents		10,515		8,505
Short-term investments:
U.S. agency securities		—		1,751
Municipal securities		355		355
Corporate commercial paper		2,299		1,250
Foreign government bonds		501		500
Corporate debt		6,247		5,763
Total short-term investments		9,402		9,619
Restricted cash—money market fund		875		875
Total cash, cash equivalents, investments and restricted cash	$	20,792	$	18,999