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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Presentation of fair value of financial assets using the inputs    
Total financial assets $ 223 $ 733
Money market funds
   
Presentation of fair value of financial assets using the inputs    
Total financial assets 223 733
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Presentation of fair value of financial assets using the inputs    
Total financial assets 223 733
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
   
Presentation of fair value of financial assets using the inputs    
Total financial assets 223 733
Significant Other Observable Inputs (Level 2)
   
Presentation of fair value of financial assets using the inputs    
Total financial assets      
Significant Other Observable Inputs (Level 2) | Money market funds
   
Presentation of fair value of financial assets using the inputs    
Total financial assets      
Significant Unobservable Inputs (Level 3)
   
Presentation of fair value of financial assets using the inputs    
Total financial assets      
Significant Unobservable Inputs (Level 3) | Money market funds
   
Presentation of fair value of financial assets using the inputs    
Total financial assets