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Financial Statement Details (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial Statement Details (Textual) [Abstract]
Net unrealized gains (losses)	$ 14,000	$ 8,000
Company's investment portfolio of marketable equity securities		385,000
Company's investment portfolio with a fair value		38,000
Marketable securities other-than-temporary loss	38,000	347,000
Property and equipment	100,000	70,000	167,000
Depreciation and amortization expense	$ 9,400,000	$ 11,100,000	$ 10,000,000

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The change during the period, from the beginning balance of accumulated depreciation, depletion and amortization (relating to property, plant and equipment) to the ending balance.

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The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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