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Debt - Narrative (Details) - USD ($)
12 Months Ended
Dec. 08, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 22, 2019
Jul. 13, 2018
Jul. 12, 2018
Apr. 08, 2018
Debt Instrument [Line Items]                
Debt fee   $ 728,000 $ 1,372,000          
Notes payable borrowing capacity   14,170,000            
Accumulated depreciation, capital leased assets under equipment leases   $ 1,167,000 1,013,000          
Minimum                
Debt Instrument [Line Items]                
Interest rate on notes   6.48%            
Maximum                
Debt Instrument [Line Items]                
Interest rate on notes   7.49%            
Senior Secured Revolving Credit Facility                
Debt Instrument [Line Items]                
Amount available for draw   $ 15,500,000            
Senior Secured Revolving Credit Facility | Jeffries Finance L L C                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 45,000,000             $ 60,000,000
Credit facility agreement, term 3 years              
Limit on ability to sell, transfer or dispose of assets, aggregate amount           $ 55,000,000 $ 25,000,000  
Limit on capital lease obligations, aggregate principal amount           $ 30,000,000 $ 15,000,000  
Assets Held under Capital Leases                
Debt Instrument [Line Items]                
Assets under equipment leases, gross   657,000 1,484,000          
Assets under equipment leases, depreciation expense   $ 155,000 $ 255,000 $ 293,000        
ABR | Senior Secured Revolving Credit Facility | Jeffries Finance L L C | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%              
ABR | Senior Secured Revolving Credit Facility | Jeffries Finance L L C | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate 3.00%              
LIBOR | Senior Secured Revolving Credit Facility | Jeffries Finance L L C | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate 3.00%              
LIBOR | Senior Secured Revolving Credit Facility | Jeffries Finance L L C | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate 4.00%              
Scenario, Forecast | Senior Secured Revolving Credit Facility | Jeffries Finance L L C                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity         $ 50,000,000.0      
Capital leases | Minimum                
Debt Instrument [Line Items]                
Interest rate on notes   6.80%            
Capital leases | Maximum                
Debt Instrument [Line Items]                
Interest rate on notes   7.10%