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
6 Months Ended
Jun. 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 0   112,371
Reclassification to permanent equity   $ 8,300 $ 8,344