Investments (Details Textual) (USD $)	6 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	$ 29,928,000	$ 50,528,000
Long-term investment	2,000,000	2,000,000
Investments (Textual) [Abstract]
Impairment of investments	0
Time deposits of cash and cash equivalents	6,000,000	3,500,000
Peregrine Semiconductor, Corp. Series D-1 Preferred shares [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Long-term investment	2,000,000
U.S. Treasury securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	3,500,000
Corporate notes/bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	7,100,000
Commercial paper [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	$ 19,300,000

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ Details

- Definition

Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered 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. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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