Leases (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 28, 2011 sqft	Sep. 30, 2009 sqft
Leases (Textual) [Abstract]
Percentage ceiling on rent increase, annually, capital lease		3.00%
San Carlos facility capital leases termination date		Oct. 05, 2016
Impairment charge on capital lease	$ 12,600,000
Operating sublease						102,283
Additional area included in operating sublease after amendment					24,002
Operating Sublease term commenced start date		August 1, 2010
Operating Sublease term commenced period		114 months
Operating Sublease term commenced end date		January 31, 2020
Initial monthly base rent per square foot, operating lease		2.95
Operating lease expense per month after amendment		40,000
Final monthly base rent per square foot, operating lease		3.42
Rent expense for operating leases		$ 2,400,000	$ 2,200,000	$ 700,000