Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies [Abstract]

Estimated Useful Lives of Property, Plant, and Equipment

The estimated useful lives of property, plant, and equipment are as follows:

Building and improvements                                                                           10-40 years

Laboratory and other equipment                                                                           3-10 years

Furniture and fixtures                                                                           5 years