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Fair Value (Assets and Liabilities Measured on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities $ 17,595 $ 17,391
Redeemable warrants (13) (14)
Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 17,595  
Redeemable warrants 0  
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 0  
Redeemable warrants 0  
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 0  
Redeemable warrants $ (13)