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Debt (Line of Credit) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 26, 2014
Aug. 31, 2011
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]        
Revolving line of credit     $ 1,700,000 $ 0
Credit Facility, Line of Credit | Credit Facility, Fifth Amended and Restated Loan Agreement, the Agreement, August 2011        
Line of Credit Facility [Line Items]        
Line of credit, unused capacity, commitment fee percentage   0.25%    
Debt instrument, interest rate at end of period       2.17%
Percent of common stock     30.00%  
Line of Credit | Credit Facility, Fifth Amended and Restated Loan Agreement, the Agreement, August 2011 | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity   $ 10,000,000    
SunTrust Bank | Line of Credit | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions $ 20,000,000      
Expiration period 3 years      
Line of credit, maximum borrowing capacity $ 12,000,000      
Interest rate, minimum 1.00%      
Interest rate, maximum 2.85%      
Line of credit, unused capacity, commitment fee percentage 0.25%      
Debt instrument, interest rate at end of period     1.20%  
Deferred finance costs     $ 100,000