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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
Noncontrolling Interest
Total
Beginning Balance at Dec. 31, 2020 $ 3 $ 84,411   $ (74,874) $ 9,540 $ 1 $ 9,541
Beginning Balances (in shares) at Dec. 31, 2020 30,077            
Shares issued upon exercise of options ($0.89 per share)   55     55   55
Shares issued upon exercise of options ($0.89 per share) (in shares) 64            
Shares issued upon exercise of options ($2.93 per share) (in shares) 6            
Fair value of stock issued in payment of accrued compensation   217     217   217
Fair value of stock issued in payment of accrued compensation (in shares) 64            
Share based compensation   418     418   418
Shares issued through the use of At-The Market issuance   5,309     5,309   5,309
Shares issued through the use of At-The Market issuance (in shares) 1,093            
Shares issued for services ($1.93 per share)   7     7   7
Shares issued for services ($1.93 per share) (in shares) 4            
Shares issued upon exercise of options ($1.90 per share)   12     12   12
Shares issued upon exercise of options ($1.90 per share) (in shares) 6            
Shares issued upon exercise of options ($3.80 per share)   36     36   36
Shares issued upon exercise of options ($3.80 per share) (in shares) 9            
Shares issued upon exercise of options ($1.21 per share)   155     155   155
Shares issued upon exercise of options ($1.21 per share) (in shares) 166            
Shares issued upon exercise of options ($3.10 per share)   54     54   54
Shares issued upon exercise of options ($3.10 per share) (in shares) 18            
Shares issued upon exercise of options ($1.85 per share)   6     6   6
Shares issued upon exercise of options ($1.85 per share) (in shares) 3            
Shares issued upon exercise of options ($0.98 per share) (in shares) 23            
Shares issued upon exercise of warrants ($1.80 per share)   67     67   67
Shares issued upon exercise of warrants ($1.80 per share) (in shares) 38            
Fair value of stock options issued for board service   262     262   262
Shares Issued For Services ($2.33 per share)   26     26   26
Shares issued for services ($2.33 per share) (in shares) 11            
Foreign-Exchange Translation Adjustment     $ 9   9   9
Net loss       (7,891) (7,891) $ (1) (7,892)
Ending Balance at Dec. 31, 2021 $ 3 91,035 9 (82,765) 8,282   8,282
Ending Balances (in shares) at Dec. 31, 2021 31,582            
Shares issued upon exercise of options ($0.89 per share) (in shares) 11            
Shares issued upon exercise of options ($2.93 per share) (in shares) 3            
Fair value of stock issued in payment of accrued compensation   95     95   95
Fair value of stock issued in payment of accrued compensation (in shares) 66            
Fair value of stock options granted in payment of accrued compensation   12     12   12
Share based compensation   373     373   373
Share based compensation (in shares) 67            
Shares issued through the use of At-The Market issuance   587     587   587
Shares issued through the use of At-The Market issuance (in shares) 501            
Shares issued for services ($1.93 per share)   25     25   25
Shares issued for services ($1.93 per share) (in shares) 13            
Shares issued for services ($0.66 per share)   1     1   1
Shares issued for services ($0.66 per share) (in shares) 2            
Shares issued in stock/rights offering $ 1 4,210     4,211   4,211
Shares issued in stock/rights offering (in shares) 4,186            
Shares issued pursuant to purchase right ($1.11 per share)   1,741     1,741   1,741
Shares issued pursuant to purchase right ($1.11 per share) (in shares) 1,592            
Foreign-Exchange Translation Adjustment     (17)   (17)   (17)
Net loss       (5,758) (5,758)   (5,758)
Ending Balance at Dec. 31, 2022 $ 4 $ 98,079 $ (8) $ (88,523) $ 9,552   $ 9,552
Ending Balances (in shares) at Dec. 31, 2022 38,023