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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (loss)
Accumulated Deficit
Total ClearSign Technologies Corp. Stockholders' Equity
Total
Beginning Balance at Dec. 31, 2021 $ 3 $ 91,035 $ 9 $ (82,765) $ 8,282  
Beginning Balances (in shares) at Dec. 31, 2021 31,582,000          
Shares issued upon exercise of options ($0.89 per share) (in shares) 1,000          
Shares issued upon exercise of options ($2.93 per share) (in shares) 3,000          
Fair value of stock issued in payment of accrued compensation   95     95  
Fair value of stock issued in payment of accrued compensation (in shares) 66,000          
Fair value of stock options granted in payment of accrued compensation   12     12  
Share based compensation   80     80  
Share based compensation (in shares) 3,000          
Shares issued through the use of At-The Market issuance   578     578  
Shares issued through the use of At-The Market issuance (in shares) 496,000          
Shares issued for services ($1.93 per share)   7     7  
Shares issued for services ($1.93 per share) (in shares) 4,000          
Net loss       (1,490) (1,490) $ (1,490)
Ending Balance at Mar. 31, 2022 $ 3 91,807 9 (84,255) $ 7,564  
Ending Balances (in shares) at Mar. 31, 2022 32,155,000          
Beginning Balance at Dec. 31, 2022 $ 4 98,079 (8) (88,523)   9,552
Beginning Balances (in shares) at Dec. 31, 2022 38,023,000          
Fair value of stock issued in payment of accrued compensation   234       234
Fair value of stock issued in payment of accrued compensation (in shares) 296,000          
Share based compensation   227       227
Share based compensation (in shares) 223,000          
Shares issued for services ($0.66 per share)   3       3
Shares issued for services ($0.66 per share) (in shares) 4,000          
Net loss       (1,429)   (1,429)
Ending Balance at Mar. 31, 2023 $ 4 $ 98,543 $ (8) $ (89,952)   $ 8,587
Ending Balances (in shares) at Mar. 31, 2023 38,546,000