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Balance Sheet Account Details (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance Sheet Account Details (Textual) [Abstract]
Available-for-sale securities in a gross unrealized loss position, maturities term			12 months
Sales of securities resulting in gross realized gains or losses			$ 0
Other-than-temporary impairments considered			0
Depreciation expenses	$ 3,900	$ 800	$ 8,842	$ 1,794

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale 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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