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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Other Comprehensive Income
Accumulated Deficit
Total ClearSign Technologies Corp. Stockholders' Equity
Noncontrolling Interest
Total
Shares issued upon exercise of options ($1.90 per share)   $ 33     $ 33   $ 33
Shares issued upon exercise of options ($1.90 per share) (in shares) 17            
Shares issued upon exercise of options ($0.89 per share)   17     17   17
Shares issued upon exercise of options ($0.89 per share) (in shares) 19            
Shares issued for services ($2.33 per share)   9     9   9
Shares issued for services ($2.33 per share) (in shares) 4            
Shares issued for services ($1.03 per share)   8     8   8
Shares issued for services ($1.03 per share) (in shares) 8            
Shares issued upon exercise of options ($1.00 per share)   65     65   65
Shares issued upon exercise of options ($1.00 per share) (in shares) 65            
Shares issued upon exercise of options ($0.72 per share)   11     11   11
Shares issued upon exercise of options ($0.72 per share) (in shares) 15            
Fair value of stock issued in payment of accrued compensation   407     407   407
Fair value of stock options issued for board service   334     334   334
Share based compensation   264     264   264
Secondary offering ($2 per share)   6,053     6,053   6,053
Secondary offering ($2 per share) (in shares) 3,242            
Net loss       $ (6,884) (6,884) $ (2) (6,886)
Balance at the end at Dec. 31, 2020 $ 3 84,411   (74,874) 9,540 1 9,541
Balance at the beginning at Dec. 31, 2019 $ 3 77,210   (67,990) 9,223 3 9,226
Balances (in shares) at Dec. 31, 2020 30,077            
Balances (in shares) at Dec. 31, 2019 26,707            
Shares issued through use of At The Market issuance ($5.03 average per share)   5,309   0 5,309 0 5,309
Exercised Options ($3.80 per share)   36   0 36 0 36
Shares issued upon exercise of options ($3.80 per share) (in shares) 9            
Shares issued upon exercise of options ($3.10 per share)   54   0 54 0 54
Shares issued upon exercise of options ($3.10 per share) (in shares) 18            
Shares issued upon exercise of options ($2.93 per share)       0 0 0 0
Shares issued upon exercise of options ($2.93 per share) (in shares) 6            
Shares issued upon exercise of options ($1.90 per share)   12   0 12 0 12
Shares issued upon exercise of options ($1.90 per share) (in shares) 6            
Shares issued upon exercise of options ($1.85 per share)   6   0 6 0 6
Shares issued upon exercise of options ($1.85 per share) (in shares) 3            
Shares issued upon exercise of options ($1.21 per share)   155   0 155 0 155
Shares issued upon exercise of options ($1.21 per share) (in shares) 166            
Shares issued upon exercise of options ($0.98 per share)       0 0 0 0
Shares issued upon exercise of options ($0.98 per share) (in shares) 23            
Shares issued upon exercise of options ($0.89 per share)   55   0 55 0 55
Shares issued upon exercise of options ($0.89 per share) (in shares) 64            
Shares issued upon exercise of warrants ($1.80 per share)   67   0 67 0 67
Shares issued upon exercise of warrants ($1.80 per share) (in shares) 38            
Shares issued for services ($2.33 per share)   26   0 26 0 26
Shares issued for services ($2.33 per share) (in shares) 11            
Shares issued for services ($1.93 per share)   7   0 7 0 7
Shares issued for services ($1.93 per share) (in shares) 4            
Fair value of stock issued in payment of accrued compensation   217   0 217 0 217
Fair value of stock issued in payment of accrued compensation (in shares) 64            
Fair value of stock options issued for board service   262   0 262 0 262
Share based compensation   418   0 418 0 418
Shares issued through the use of At-The Market issuance (in shares) 1,093            
Foreign-Exchange Translation Adjustment     $ 9 0 9 0 9
Net loss       (7,891) (7,891) (1) (7,892)
Balance at the end at Dec. 31, 2021 $ 3 91,035 $ 9 (82,765) 8,282 0 8,282
Balance at the beginning at Dec. 31, 2020 $ 3 $ 84,411   $ (74,874) $ 9,540 $ 1 $ 9,541
Balances (in shares) at Dec. 31, 2021 31,582            
Balances (in shares) at Dec. 31, 2020 30,077