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SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]            
Balance at beginning of Current Period       $ 999    
Accretion expense, included in depreciation and amortization expense       105    
Acquired ARO's       10,410    
Disposals       (188)    
Payments       (378)    
Balance at end of Current Period   $ 10,948   10,948    
Lessor Income            
Lessor income   113 $ 67 239 $ 279  
Sublease income   262 $ 355 736 $ 1,091  
Defined Contribution Plan            
401(k) match expense   $ 100   $ 100    
Payroll Tax Deferral           $ 6,000
Matching contribution as a percentage of employee contributions 50.00%          
Percentage of Employee compensation in matching contribution 4.00%