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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2021   23,460,212      
Beginning balance at Dec. 31, 2021 $ 147,301 $ 23 $ (47,692) $ 102,106 $ 92,864
Beginning balance (in shares) at Dec. 31, 2021     (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (in shares)   323,742      
Stock-based compensation 464 $ 1   463  
Repurchase of common shares to satisfy minimum tax withholdings (in shares)   (59,736)      
Repurchase of common shares to satisfy minimum tax withholdings (382)     (382)  
Net loss (3,033)       (3,033)
Ending balance (in shares) at Mar. 31, 2022   23,724,218      
Ending balance at Mar. 31, 2022 144,350 $ 24 $ (47,692) 102,187 89,831
Ending balance (in shares) at Mar. 31, 2022     (4,618,146)    
Beginning balance (in shares) at Dec. 31, 2021   23,460,212      
Beginning balance at Dec. 31, 2021 147,301 $ 23 $ (47,692) 102,106 92,864
Beginning balance (in shares) at Dec. 31, 2021     (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (3,359)        
Ending balance (in shares) at Jun. 30, 2022   23,693,208      
Ending balance at Jun. 30, 2022 144,505 $ 24 $ (47,692) 102,668 89,505
Ending balance (in shares) at Jun. 30, 2022     (4,618,146)    
Beginning balance (in shares) at Mar. 31, 2022   23,724,218      
Beginning balance at Mar. 31, 2022 144,350 $ 24 $ (47,692) 102,187 89,831
Beginning balance (in shares) at Mar. 31, 2022     (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (in shares)   (30,459)      
Stock-based compensation 484     484  
Repurchase of common shares to satisfy minimum tax withholdings (in shares)   (551)      
Repurchase of common shares to satisfy minimum tax withholdings (3)     (3)  
Net loss (326)       (326)
Ending balance (in shares) at Jun. 30, 2022   23,693,208      
Ending balance at Jun. 30, 2022 144,505 $ 24 $ (47,692) 102,668 89,505
Ending balance (in shares) at Jun. 30, 2022     (4,618,146)    
Beginning balance (in shares) at Dec. 31, 2022   23,788,319      
Beginning balance at Dec. 31, 2022 $ 139,979 $ 24 $ (47,692) 103,698 83,949
Beginning balance (in shares) at Dec. 31, 2022 (4,618,146)   (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (in shares)   483,242      
Stock-based compensation $ 563     563  
Issuance of common stock pursuant to Arq Acquisition, net of offering costs (in shares)   3,814,864      
Issuance of common stock pursuant to Arq Acquisition, net of offering costs 12,437 $ 4   12,433  
Issuance of common stock related to PIPE Investment, net of offering costs (in shares)   3,842,315      
Issuance of common stock related to PIPE Investment, net of offering costs 15,220 $ 4   15,216  
Issuance of warrant 826     826  
Repurchase of common shares to satisfy minimum tax withholdings (in shares)   (74,104)      
Repurchase of common shares to satisfy minimum tax withholdings (146)     (146)  
Preferred stock dividends declared on redeemable preferred stock (157)       (157)
Net loss (7,508)       (7,508)
Ending balance (in shares) at Mar. 31, 2023   31,854,636      
Ending balance at Mar. 31, 2023 161,214 $ 32 $ (47,692) 132,590 76,284
Ending balance (in shares) at Mar. 31, 2023     (4,618,146)    
Beginning balance (in shares) at Dec. 31, 2022   23,788,319      
Beginning balance at Dec. 31, 2022 $ 139,979 $ 24 $ (47,692) 103,698 83,949
Beginning balance (in shares) at Dec. 31, 2022 (4,618,146)   (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ (13,364)        
Ending balance (in shares) at Jun. 30, 2023   37,194,159      
Ending balance at Jun. 30, 2023 $ 174,815 $ 37 $ (47,692) 152,042 70,428
Ending balance (in shares) at Jun. 30, 2023 (4,618,146)   (4,618,146)    
Beginning balance (in shares) at Mar. 31, 2023   31,854,636      
Beginning balance at Mar. 31, 2023 $ 161,214 $ 32 $ (47,692) 132,590 76,284
Beginning balance (in shares) at Mar. 31, 2023     (4,618,146)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (in shares)   (16,430)      
Stock-based compensation 545     545  
Issuance of common stock upon conversion of preferred stock (in shares)   5,362,926      
Issuance of common stock upon conversion of preferred stock 18,926 $ 5   18,921  
Repurchase of common shares to satisfy minimum tax withholdings (in shares)   (6,973)      
Repurchase of common shares to satisfy minimum tax withholdings (14)     (14)  
Net loss (5,856)       (5,856)
Ending balance (in shares) at Jun. 30, 2023   37,194,159      
Ending balance at Jun. 30, 2023 $ 174,815 $ 37 $ (47,692) $ 152,042 $ 70,428
Ending balance (in shares) at Jun. 30, 2023 (4,618,146)   (4,618,146)