v2.4.0.6
Commitments and Contingencies (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Facility A [Member]
Dec. 31, 2011
Facility B [Member]
Dec. 31, 2011
Convertible Senior Notes [Member]
Dec. 31, 2010
Convertible Senior Notes [Member]
Mar. 31, 2007
Convertible Senior Notes [Member]
Commitments And Contingencies [Line Items]                
Loan agreement       $ 5,000,000 $ 3,000,000      
Aggregate principal amount               60,000,000
Common stock, initial conversion rate           128.2051    
Principal amount of notes           1,000    
Conversion price of senior notes           $ 7.80    
Debt related commitment fees and debt issuance costs           2,700,000    
Shares of common stock issued             7,900,000  
Common stock par value             $ 0.001  
Aggregate principal amount of the notes previously held             60,000,000  
Loss on debt extinguishment upon conversion of convertible debt 0 (8,490,000) 0       8,500,000  
Option to renew lease 5              
Potential rental rate adjustment, minimum 2.50%              
Potential rental rate adjustment, maximum 4.00%              
Term of lease (years) 3              
Rent expense 2,600,000 2,100,000 1,500,000          
Recorded Unconditional Purchase Obligation Due within One Year $ 7,100,000