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Long-term Debt - Narrative (Details)
9 Months Ended
Aug. 16, 2018
USD ($)
Sep. 30, 2019
USD ($)
Aug. 15, 2018
USD ($)
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC)      
Debt Instrument [Line Items]      
Debt term 4 years    
Amount of increase in maximum revolver $ 10,000,000    
Maximum amount of certain indebtedness 50,000,000   $ 40,000,000
Current borrowing capacity   $ 37,600,000  
Required liquidity maintained five consecutive business days 6,250,000    
Required liquidity maintained any business day $ 5,000,000    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | Minimum      
Debt Instrument [Line Items]      
Fixed charge coverage ratio 1.1    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | Subsidiary Issuer      
Debt Instrument [Line Items]      
Percentage of obligations secured by stock of Subsidiary Borrowers   100.00%  
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | Mexican Subsidiary      
Debt Instrument [Line Items]      
Maximum amount of certain indebtedness $ 5,000,000    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | ION International Holdings L.P.      
Debt Instrument [Line Items]      
Percentage of obligations secured by stock of Subsidiary Borrowers   65.00%  
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | Base Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate for debt 3.00%    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate for debt 2.00%    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate for debt 4.00%    
Line of credit | Revolving credit facility (maturing August 16, 2023) | PNC Bank, National Association (PNC) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate for debt 3.00%    
Senior secured notes | Senior secured second-priority lien notes (maturing December 15, 2021)      
Debt Instrument [Line Items]      
Stated rate on debt   9.125%  
Data Library | E&P Technology & Services | Line of credit | Revolving credit facility (maturing August 16, 2023)      
Debt Instrument [Line Items]      
Maximum amount of certain indebtedness $ 28,500,000   $ 15,000,000