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Long-Term Debt and Capital Lease Obligations - Term Loans (Details Textual) - Term Loan - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 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 was 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   $ 0        
Minimum | 90 Day LIBOR Rate              
Debt Instrument [Line Items]              
Interest rate on term loans 4.00%            
Maximum | 90 Day LIBOR Rate              
Debt Instrument [Line Items]              
Interest rate on term loans 4.50%