Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation??and Summary of Significant Accounting Policies - Statement of Operations Correction (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Statement of Operations Correction (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 14, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 14, 2021
Sep. 30, 2021
Sep. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
General and administrative expenses     $ 11,889 $ 1,205   $ 22,933 $ 3,652
Operating Income (Loss)     (12,259) (589)   (22,964) (1,834)
Net income (loss) $ (7,067) $ (8,848) (24,177) (602) $ (19,278) (34,606) (1,819)
Net income (loss) attributable to Legacy Archaea     (8,569) $ (860)   (18,744) $ (2,205)
As Previously Reported              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
General and administrative expenses     9,053     20,097  
Operating Income (Loss)     (9,423)     (20,128)  
Net income (loss)     (21,341)     (31,770)  
Net income (loss) attributable to Legacy Archaea     (5,733)     (15,908)  
Adjustment              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
General and administrative expenses     2,836     2,836  
Operating Income (Loss)     (2,836)     (2,836)  
Net income (loss)     (2,836)     (2,836)  
Net income (loss) attributable to Legacy Archaea     $ (2,836)     $ (2,836)