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Balance Sheet Details (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance Sheet Details (Textual) [Abstract]
Depreciation and amortization expense on equipment and improvements	$ 4.4	$ 4.1	$ 2.9

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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