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Series B Convertible Preferred Stock (Details) (USD $)
 9 Months Ended 282 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2012
Series B Preferred Stock
Sep. 30, 2012
Series B Preferred Stock
Minimum
Sep. 30, 2012
Series B Preferred Stock
Maximum
Mar. 31, 2012
Series B-1 Preferred Stock
Sep. 30, 2012
Series B-1 Preferred Stock
Sep. 30, 2012
Series A preferred stock
Series B Convertible Preferred Stock                
Number of shares sold           12,308    
Offering price per share (in dollars per share)           $ 3,250    
Net proceeds from the sale of preferred stock $ 37,620,000 $ 89,267,000       $ 37,620,000    
Ratio for conversion into Series B-2 Preferred Stock             1  
Convertible preferred stock, shares authorized               45,000
Convertible preferred stock, shares issued               0
Convertible preferred stock, shares outstanding               0
Period of closing of offering after which shares are convertible     5 years          
Conversion price per share (in dollars per share)     $ 3.25          
Percentage of cumulative dividend rate     11.50%          
Period for accrual of dividend       5 years 10 years      
Percentage of accrued dividend rate     8.00%          
Carrying value of convertible preferred stock 40,358,000 40,358,000         2,668,000  
Redemption value             31,102,000  
Accretion of carrying value to redemption value             $ 2,668,000  
Period to determine redemption value             5 years