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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Leasehold improvements
Dec. 31, 2012
Leasehold improvements
Dec. 31, 2013
Leasehold improvements
Minimum
Dec. 31, 2013
Leasehold improvements
Maximum
Dec. 31, 2013
Research and laboratory equipment
Dec. 31, 2012
Research and laboratory equipment
Dec. 31, 2013
Research and laboratory equipment
Minimum
Dec. 31, 2013
Research and laboratory equipment
Maximum
Dec. 31, 2013
Office equipment and furniture
Dec. 31, 2012
Office equipment and furniture
Dec. 31, 2013
Office equipment and furniture
Minimum
Dec. 31, 2013
Office equipment and furniture
Maximum
Property, plant and equipment                            
Useful lives in years from date of acquisition         5 years 15 years     3 years 5 years     3 years 5 years
Property, plant and equipment, gross $ 7,928 $ 7,711 $ 922 $ 867     $ 5,668 $ 5,519     $ 1,338 $ 1,325    
Less: accumulated depreciation and amortization (7,653) (7,582)                        
Property, Plant and Equipment, Net $ 275 $ 129