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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 30, 2020
May 20, 2020
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 17, 2014
Debt Instrument [Line Items]                
Loss on extinguishment of debt         $ (600,000)      
Issuance of letter of credit         19,896,000      
Restricted Cash         15,500,000      
Outstanding borrowings       $ 19,504,000 20,396,000      
Debt issuance cost       $ 400,000 500,000 $ 0    
Revolving line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 50,000,000.0       50,000,000.0     $ 25,000,000
Letter of credit outstanding $ 15,500,000       15,500,000      
Letter of credit cash collateral     $ 15,500,000   $ 15,500,000 $ 15,500,000    
Debt instrument term 3 years       3 years      
Percentage of qualifying investment grade accounts receivable 95.00%       95.00%      
Percentage of qualifying Non-investment grade accounts receivable 90.00%       90.00%      
Unrestricted cash $ 25,000,000.0       $ 25,000,000.0      
Percentage of utilization of credit facility       4.75%        
Outstanding borrowings       $ 19,500,000 20,400,000      
Unused borrowing capacity       $ 11,500,000 $ 29,600,000      
Revolving line of credit | Minimum                
Debt Instrument [Line Items]                
Debt instrument margin rate       3.75% 3.75%      
Percentage of unused commitment fee       0.375%        
Revolving line of credit | Maximum                
Debt Instrument [Line Items]                
Debt instrument margin rate       4.25% 4.25%      
Revolving line of credit | LIBOR                
Debt Instrument [Line Items]                
Debt Instrument Floor Rate 1       0.75% 0.75%      
Percentage of utilization of credit facility         5.00%      
Percentage of unused commitment fee         0.375%      
Revolving line of credit | LIBOR | Minimum                
Debt Instrument [Line Items]                
Minimum monthly average utilization of debt       $ 15,000,000.0 $ 15,000,000.0      
Secured Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 20,000,000.0            
Debt instrument term   2 years            
Percentage of limitation of qualifying accounts receivable   80.00%            
Loss on extinguishment of debt         $ 600,000      
Secured Facility | Minimum                
Debt Instrument [Line Items]                
Minimum monthly average utilization of debt   $ 10,000,000.0            
Secured Facility | LIBOR                
Debt Instrument [Line Items]                
Spread on variable rate   7.25%            
Debt Instrument Floor Rate 1   1.50%            
Letter of credit                
Debt Instrument [Line Items]                
Letter of credit outstanding             $ 15,500,000  
Issuance of letter of credit     $ 15,500,000