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Debt (Details) - USD ($)
3 Months Ended
Dec. 20, 2019
Sep. 17, 2018
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Borrowings under line of credit     $ 0  
Credit Agreement Amendment        
Debt Instrument [Line Items]        
Debt issuance costs     500,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowing capacity $ 75,000,000.0 $ 40,000,000.0    
Commitment fee percentage   0.50%    
Facility fee percentage 0.50% 1.75%    
Maximum borrowing capacity $ 75,000,000.0 $ 40,000,000.0    
Covenant, minimum cash and cash equivalents 6,000,000.0 6,000,000.0    
Covenant, maximum cash and cash equivalents 11,300,000      
Minimum liquidity 10,000,000.0      
Maximum liquidity $ 18,800,000      
Debt issuance costs   1,200,000    
Revolving Credit Facility | Credit Agreement Amendment        
Debt Instrument [Line Items]        
Debt issuance costs     $ 700,000 $ 700,000
Letter of Credit        
Debt Instrument [Line Items]        
Borrowing capacity   $ 5,000,000.0    
Eligible Commissions Receivables, Preceding Three Months | Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowing base percentage     80.00%  
Eligible Commissions Receivables, Succeeding Three Months | Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowing base percentage     80.00%  
Eligible Commissions Receivables, Succeeding Six Months | Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowing base percentage     50.00%