Quarterly report pursuant to Section 13 or 15(d)

Term Loan Agreements and Long Term Debt - MidCap Term Loan and Revolving Loan Agreement - Narrative (Details)

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Term Loan Agreements and Long Term Debt - MidCap Term Loan and Revolving Loan Agreement - Narrative (Details)
 3 Months Ended 6 Months Ended
May 22, 2018
USD ($)
Oct. 25, 2016
USD ($)
item
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]            
Repayment of debt         $ 22,492,122 $ 8,572
Payment of revolving credit facility         30,488,886 26,314,797
Interest expense     $ 544,207 $ 554,384 $ 1,129,825 $ 1,061,933
MidCap Term Loan Agreement            
Debt Instrument [Line Items]            
Number of months requiring principal and interest payments | item   30        
Annual agency fee, percent of aggregate principal amount   0.25%        
Exit fee percent 5.00% 5.00%        
Prepayment fee percent, year one   3.00%        
Prepayment fee percent, year two 2.00% 2.00%        
Prepayment fee percent, thereafter   1.00%        
Repayment of debt $ 22,500,000          
Prepayment and exit fees 1,500,000          
Unamortized deferred financing costs 473,000          
MidCap Revolving Loan Agreement            
Debt Instrument [Line Items]            
Payment of revolving credit facility 3,000,000          
Percent of borrowing base which accrues interest   30.00%        
Possible increase to loan agreement at Company's request   $ 15,000,000        
Collateral management fee, percent   0.50%        
Unused line fee, percent   0.50%        
Prepayment fees $ 236,000