Quarterly report pursuant to Section 13 or 15(d)

Common Stock Subject to Conditional Redemption - Pfizer Settlement Agreement (Details)

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Common Stock Subject to Conditional Redemption - Pfizer Settlement Agreement (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 9 Months Ended
Apr. 30, 1996
Sep. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Common Stock Subject to Conditional Redemption - Pfizer Settlement Agreement (Textual) [Abstract]        
Date of settlement agreement   April 1996    
Exchange ratio of common shares $ 74.25      
Common stock redeemed        112,371
Reclassification to permanent equity      $ 8,300 $ 8,344