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Commitments and Contingencies (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
September Fifteenth Two Thousand Eight [Member]
Jun. 30, 2012
September Eighteenth Two Thousand Eight [Member]
Jun. 30, 2012
Insurance proceeds [Member]
Dec. 31, 2011
Company [Member]
Commitments and Contingencies (Textual) [Abstract]          
"Lawsuit" filed date   September 15, 2008 September 18, 2008    
Payment of fees and expenses to the plaintiffs' counsel $ 900,000     $ 500,000 $ 400,000
Commitments and Contingencies (Additional Textual) [Abstract]          
Company borrowed against the facility 5,000,000        
Borrowings under the facility interest rate 1.00%        
Cash equivalents and marketable securities held at bank $ 25,200,000