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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Changes in warrant liability    
Balance, end of period    $ 16,622 [1]
Level 3 [Member]
   
Changes in warrant liability    
Balance, beginning of period 16,622 [1] 26,193
Fair value adjustment, net (2,649) (9,571)
Reclassification to additional paid-in-capital (13,973)   
Net Transfer in /(Out)      
Balance, end of period    $ 16,622 [1]
[1] The fair value of common stock warrants is estimated using a Black-Scholes option-pricing model. See Note 11- Convertible Preferred Stock and Stock Warrants for additional information