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Long-Term Debt and Capital Lease Obligations - Term Loans (Details Textual) - Term Loan - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Apr. 30, 2013
Debt Instrument [Line Items]          
Term loan maximum drawing limit   $ 5,000,000 $ 1,000,000 $ 3,000,000 $ 4,000,000
Term of Principal payments description 36 equal monthly installments        
Term of principal payments 36 months        
Period of interest rate related to LIBOR 90 days        
Interest rate of term loan description The interest rate on the Term Loans is between 4.0% and 4.5% per annum above the ninety day LIBOR rate, adjusted as of the date of any change in the ninety day LIBOR.        
Term Loan, principal payment $ 10,400,000        
Long-term portion of Convertible Notes $ 0        
Minimum | 90 Day LIBOR Rate          
Debt Instrument [Line Items]          
Interest rate of revolving credit agreement 4.00%        
Maximum | 90 Day LIBOR Rate          
Debt Instrument [Line Items]          
Interest rate of revolving credit agreement 4.50%