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Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 17, 2018
Jan. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Debt issuance costs - non-current     $ 1,099,000 $ 0
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Borrowing capacity $ 40,000,000      
Commitment fee percentage 0.50%      
Facility fee percentage 1.75%      
Maximum borrowing capacity $ 40,000,000      
Line of credit facility, covenant, minimum cash and cash equivalents 6,000,000      
Debt issuance costs - non-current     1,200,000  
Borrowings under line of credit     $ 5,000,000  
Letter of Credit        
Line of Credit Facility [Line Items]        
Borrowing capacity $ 5,000,000      
Eligible Commissions Receivables, Preceding Three Months | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Borrowing base percentage     80.00%  
Eligible Commissions Receivables, Succeeding Three Months | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Borrowing base percentage     80.00%  
Eligible Commissions Receivables, Succeeding Six Months | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Borrowing base percentage     50.00%  
Subsequent Event | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Repayments of Debt   $ 5,000,000