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Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 24, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Finance leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 4.70% to 6.45% through 2025   $ 5,338   $ 5,338   $ 6,459
Total debt   31,838   31,838   45,459
Less - Current portion of long-term debt   (8,460)   (8,460)   (6,536)
Less - Unamortized discount and debt issuance costs   (284)   (284)   (2,410)
Long-term debt   23,094   23,094   36,513
Loss on early debt extinguishment   $ 0 $ 0 1,961 $ 0  
Prepayment penalty and other costs associated with early debt extinguishment       $ 1,376 $ 0  
Minimum            
Debt Instrument [Line Items]            
Finance lease, discount rate   4.70%   4.70%    
Maximum            
Debt Instrument [Line Items]            
Finance lease, discount rate   6.45%   6.45%    
2019 Refinancing Agreement            
Debt Instrument [Line Items]            
Loss on early debt extinguishment $ 2,000          
Write off of debt issuance and discount costs 2,600          
Reversal or warrant liability 2,000          
Prepayment penalty and other costs associated with early debt extinguishment $ 1,400          
Secured Debt | 2019 Refinancing Term Loan - term loan payable in quarterly installments of principal, (commencing in September 2020) plus interest through April 2022            
Debt Instrument [Line Items]            
Long term debt   $ 0   $ 0   39,000
Secured Debt | Wintrust Term Loan - term loan payable in quarterly installments of principal, (commencing in March 2021) plus interest through February 2026            
Debt Instrument [Line Items]            
Long term debt   26,500   26,500   0
Revolving Credit Facility | 2019 Revolving Credit Facility            
Debt Instrument [Line Items]            
Long term debt   0   0   0
Revolving Credit Facility | Wintrust Revolving Loan            
Debt Instrument [Line Items]            
Long term debt   $ 0   $ 0   $ 0