Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies (Details)

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Basis of Presentation and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Customer 1 [Member]
     
Revenue, Major Customer [Line Items]      
Entity-wide revenue, major customer, percentage (in hundredths) 45.00% 59.00%  
Entity-wide receivable, major customer, percentage (in hundredths) 42.00%   57.00%
Customer 2 [Member]
     
Revenue, Major Customer [Line Items]      
Entity-wide revenue, major customer, percentage (in hundredths) 35.00% 36.00%  
Entity-wide receivable, major customer, percentage (in hundredths) 47.00%   43.00%
Property equipment building and leasehold improvements [Member]
     
Long-Lived Assets to be Abandoned [Line Items]      
Accelerated depreciation 1.4    
Impairment loss 0.8