Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Paragraph 1

-Article 5

+ Details

Cash, Cash Equivalents and Short-Term Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash, Cash Equivalents and Short-Term Investments
Cash and cash equivalents	$ 9,403	$ 6,211	$ 3,548	$ 2,469
Short-term investments	947	2,957
Commercial paper
Cash, Cash Equivalents and Short-Term Investments
Short-term investments	611
Corporate debt
Cash, Cash Equivalents and Short-Term Investments
Short-term investments		2,621
Bank certificate of deposit
Cash, Cash Equivalents and Short-Term Investments
Short-term investments	100	100
Cash
Cash, Cash Equivalents and Short-Term Investments
Cash and cash equivalents	6,240	571
Money market funds
Cash, Cash Equivalents and Short-Term Investments
Cash and cash equivalents	3,163	5,640
Short-term investments	$ 236	$ 236