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Debt (Narrative) (Details) - Revolving Credit Facility
Sep. 26, 2018
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity $ 40,000,000.0  
Line of credit facility, remaining borrowing capacity   $ 40,000,000.0
Debt issuance costs, net $ 100,000  
Line of credit facility, unused capacity, commitment fee percentage 0.15%  
Debt instrument adjusted quick ratio requirement in streamline period 1.05  
Debt instrument adjusted quick ratio 1.13  
2011 Loan Agreement    
Line of Credit Facility [Line Items]    
Adjusted EBITDA threshold 20.00%  
Streamline Period Applies | London Interbank Offered Rate (LIBOR)    
Line of Credit Facility [Line Items]    
Debt instrument, basis spread on variable rate 2.50%  
Streamline Period Applies | Prime Rate    
Line of Credit Facility [Line Items]    
Debt instrument, basis spread on variable rate 0.50%  
Streamline Period Does Not Apply | London Interbank Offered Rate (LIBOR)    
Line of Credit Facility [Line Items]    
Debt instrument, basis spread on variable rate 4.00%  
Streamline Period Does Not Apply | Prime Rate    
Line of Credit Facility [Line Items]    
Debt instrument, basis spread on variable rate 2.00%  
Covenant Term, Scenario One    
Line of Credit Facility [Line Items]    
Debt instrument adjusted quick ratio requirement 1.00  
Debt instrument covenant compliance adjusted earnings before interest taxes depreciation and amortization maximum $ 0  
Covenant Term, Scenario Two    
Line of Credit Facility [Line Items]    
Debt instrument adjusted quick ratio requirement 0.90  
Debt instrument, covenant compliance, adjusted earnings before interest taxes depreciation and amortization minimum $ 0  
Covenant Compliance Period Two | 2011 Loan Agreement    
Line of Credit Facility [Line Items]    
Debt instrument covenant compliance adjusted earnings before interest taxes depreciation and amortization maximum 1  
Covenant Compliance Period Three | 2011 Loan Agreement    
Line of Credit Facility [Line Items]    
Debt instrument, covenant compliance, adjusted earnings before interest taxes depreciation and amortization minimum $ 5,000,000.0