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Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Mar. 05, 2019
Oct. 18, 2017
Sep. 18, 2017
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Sep. 30, 2018
Debt Instrument [Line Items]              
Proceeds from borrowings of debt       $ 7,000,000 $ 0    
Amended and Restated Credit Agreement              
Debt Instrument [Line Items]              
One-time principal payment             $ 4,300,000
Excess cash flow payment           $ 3,600,000  
Revolving Credit Facility              
Debt Instrument [Line Items]              
Proceeds from borrowings of debt $ 7,000,000     $ 7,000,000      
Revolving Credit Facility | The New Lenders and Agent              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity     $ 20,000,000        
The New Term Loan Facility | The New Lenders and Agent              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity     60,000,000        
Proceeds from borrowings of debt   $ 60,000,000          
Quarterly amortization of principal     3,750,000        
Weighted average interest rate       5.83%      
The New Credit Facilities | The New Lenders and Agent              
Debt Instrument [Line Items]              
Remaining unamortized fees and direct costs     $ 600,000        
The New Credit Facilities | The New Lenders and Agent | Federal funds effective rate              
Debt Instrument [Line Items]              
Basis spread on variable interest rate     0.50%        
The New Credit Facilities | The New Lenders and Agent | LIBO Rate              
Debt Instrument [Line Items]              
Basis spread on variable interest rate     1.00%