Fair Value Measurement of Assets and Liabilities (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value Measurement of Assets and Liabilities (Textual) [Abstract]
Unrealized loss outstanding foreign currency exchange forward contracts	$ 0	$ 0
Euro-denominated foreign exchange forward contracts gain	0	8,000	38,000
Foreign currency gains and losses on foreign currency denominated transactions	51,000	836,000	1,700,000
Gains relate to foreign currency gain realized on the liquidation of the Company's cash holdings			2,900,000
Gains relate to proceeding for the sale of Cinterion			$ 1,200,000
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long term marketable debt securities maturity period	2 years
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long term marketable debt securities maturity period	1 year

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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The net realized foreign currency transaction gain (loss) (pretax) included in determining net income from transactions that were settled as of the balance sheet date.

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