| 
           Stockholders' Equity and Stock Based Compensation (Details) 
         | 
        12 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Sep. 30, 2014
 
          2006 Plan 
         | 
        
           Dec. 31, 2013
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2012
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2011
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2010
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2009
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2008
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2007
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2006
 
          2006 Plan
 
          Restricted stock
 
          installment 
         | 
        
           Dec. 31, 2006
 
          2006 Plan
 
          Restricted stock
 
          CEO
 
          installment 
         | 
        
           Sep. 30, 2014
 
          2012 Plan 
         | 
        
           Sep. 30, 2014
 
          2006 Plan and 2012 Plan
 
          Restricted stock 
         | 
        
           Sep. 30, 2014
 
          2006 Plan and 2012 Plan
 
          Restricted stock
 
          Minimum
 
          installment 
         | 
        
           Sep. 30, 2014
 
          2006 Plan and 2012 Plan
 
          Restricted stock
 
          Maximum
 
          installment 
         | 
        
           Dec. 31, 2013
 
          2006 Plan and 2012 Plan
 
          Restricted stock
 
          CEO
 
          installment 
         | 
      |
| Stock-based compensation | |||||||||||||||
| Number of shares of common stock initially available for award | 800,000 | 600,000 | |||||||||||||
| Options reserved for future issuance (in shares) | 0 | 541,479 | |||||||||||||
| Granted (in shares) | 56,500 | 92,000 | 15,000 | 150,500 | 140,000 | 57,500 | 30,000 | 315,000 | 200,000 | 70,689 | 40,000 | ||||
| Number of equal quarterly installments for vesting of awards | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 40 | 8 | 20 | 16 | |||
| Forfeited (in shares) | 775 | 3,525 | 8,375 | 5,875 | 3,500 | 12,500 | 34,118 | ||||||||