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Current and Long-Term Debt and Capital Lease Obligation - Narrative (Q1) (Details) - USD ($)
Jan. 12, 2021
Jan. 17, 2020
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2017
Debt Instrument [Line Items]            
Payments on long-term debt   $ 28,300,000        
Letters of credit outstanding, amount   2,854,000       $ 2,725,000
Debt collateral amount   3,274,000 $ 2,914,000      
Capital lease obligations     $ 212,000 $ 246,000 $ 502,000  
2020 Financing Agreement            
Debt Instrument [Line Items]            
Debt and line of credit maximum borrowing capacity   $ 72,500,000        
Write off of debt issuance costs $ 1,234,000          
Loss on extinguishment of debt $ 1,575,000          
2020 Financing Agreement | Prepayment Period, First 24 Months            
Debt Instrument [Line Items]            
Debt prepayment, percent of principal   3.00%        
2020 Financing Agreement | Prepayment Period, 13 Through 24 Months            
Debt Instrument [Line Items]            
Debt prepayment, change in control, percent of principal   2.25%        
2020 Financing Agreement | Prepayment Period, 25 to 36 Months            
Debt Instrument [Line Items]            
Debt prepayment, percent of principal   1.00%        
2020 Financing Agreement | Prepayment Period, After 36 Months            
Debt Instrument [Line Items]            
Debt prepayment, percent of principal   0.00%        
2020 Financing Agreement | Secured Debt            
Debt Instrument [Line Items]            
Debt face amount   $ 45,000,000.0        
Debt periodic payment, percent of principal   0.25%        
2020 Financing Agreement | Delayed Draw Term Loan            
Debt Instrument [Line Items]            
Debt maximum borrowing capacity   $ 20,000,000.0        
2020 Financing Agreement | Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit maximum borrowing capacity   7,500,000        
Line of credit maximum borrowing capacity sub-limit increase   $ 4,000,000.0