Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Property and Equipment) (Details)

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Basis of Presentation (Property and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Summary of Property and equipment    
Property and equipment , gross $ 4,632 $ 4,740
Less accumulated depreciation and amortization (3,942) (3,873)
Total property and equipment, net 690 867
Lab and office equipment
   
Summary of Property and equipment    
Property and equipment , gross 3,728 3,737
Leasehold improvements
   
Summary of Property and equipment    
Property and equipment , gross 273 387
Computer equipment and software
   
Summary of Property and equipment    
Property and equipment , gross $ 631 $ 616