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Basis of Presentation - Acquisition (Narrative) (Details) - Arq Limited
$ / shares in Units, $ in Millions
Feb. 01, 2023
USD ($)
$ / shares
shares
Business Acquisition [Line Items]  
Consideration transferred | $ $ 31.2
Series A Preferred Stock  
Business Acquisition [Line Items]  
Business acquisition, equity interest issued or issuable (in dollars per share) | $ / shares $ 0.001
Common Stock  
Business Acquisition [Line Items]  
Business acquisition, issued number of shares (in shares) | shares 3,814,864
Business acquisition, equity interest issued or issuable (in dollars per share) | $ / shares $ 0.001
Preferred Stock  
Business Acquisition [Line Items]  
Business acquisition, issued number of shares (in shares) | shares 5,294,462