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Fair Value Measurements (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Nov. 04, 2005
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Put Option [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Put Option [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Warrants [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Warrants [Member]
Assets:                              
Cash equivalents       $ 6,145,000 $ 30,646,000 $ 6,145,000 $ 30,646,000 $ 0 $ 0 $ 0 $ 0        
Liabilities:                              
Put option liability (2,250,000) (1,910,000) (1,500,000) (2,250,000) (1,910,000) 0 0 0 0 (2,250,000) (1,910,000) (2,250,000) (1,910,000)    
Warrant liability       (418,000) (627,000) 0 0 0 0 (418,000) (627,000)     (418,000) (627,000)
Change in Level 3 put option liability [Roll Forward]                              
Beginning balance (2,250,000) (1,910,000) (1,500,000) (2,250,000) (1,910,000) 0 0 0 0 (2,250,000) (1,910,000) (1,910,000) (1,170,000)    
Decrease (increase) in fair value recognized in operating expenses                       (340,000) (740,000) 209,000 4,360,000
Ending balance (2,250,000) (1,910,000) (1,500,000) (2,250,000) (1,910,000) 0 0 0 0 (2,250,000) (1,910,000) (2,250,000) (1,910,000)    
Change in Level 3 warrant liability [Roll Forward]                              
Beginning balance       (418,000) (627,000) 0 0 0 0 (418,000) (627,000)     (627,000) (4,987,000)
Decrease (increase) in fair value recognized in operating expenses                       (340,000) (740,000) 209,000 4,360,000
Ending balance       $ (418,000) $ (627,000) $ 0 $ 0 $ 0 $ 0 $ (418,000) $ (627,000)     $ (418,000) $ (627,000)