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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ 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 ($1.90 per share)   2     2   2
Shares issued upon exercise of options ($1.90 per share) (in shares) 1            
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)   4     4   4
Shares issued upon exercise of options ($1.21 per share) (in shares) 3            
Shares issued upon exercise of options ($1.80 per share)   67     67   67
Shares issued upon exercise of options ($1.80 per share) (in shares) 38            
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   410     410   410
Shares issued through the use of At-The Market issuance   4,469     4,469   4,469
Shares issued through the use of At-The Market issuance (in shares) 941            
Proceeds receivable from At-The Market issuance   (1,076)     (1,076)   (1,076)
Fair value of stock options issued for board service   210     210   210
Shares issued for services (in shares) 4            
Shares Issued For Services ($2.33 per share)   9     9   9
Net loss       (2,021) (2,021)   (2,021)
Ending Balance at Mar. 31, 2021 $ 3 88,759   (76,895) 11,867 1 11,868
Ending Balances (in shares) at Mar. 31, 2021 31,137            
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            
Net loss             (6,665)
Ending Balance at Sep. 30, 2021 $ 3 90,955   (81,538) 9,420   9,420
Ending Balances (in shares) at Sep. 30, 2021 31,575            
Beginning Balance at Mar. 31, 2021 $ 3 88,759   (76,895) 11,867 1 11,868
Beginning Balances (in shares) at Mar. 31, 2021 31,137            
Shares issued upon exercise of options ($1.21 per share)   72     72   72
Shares issued upon exercise of options ($1.21 per share) (in shares) 95            
Share based compensation   19     19   19
Shares issued through the use of At-The Market issuance   1,916     1,916   1,916
Shares issued through the use of At-The Market issuance (in shares) 152            
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) 17            
Shares issued upon exercise of options ($0.89 per share)   36     36   36
Shares issued upon exercise of options ($0.89 per share) (in shares) 42            
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 options ($2.93 per share) (in shares) 6            
Fair value of stock options issued for board service   52     52   52
Shares Issued For Services ($2.33 per share)   9     9   9
Shares issued for services ($2.33 per share) (in shares) 4            
Net loss       (2,290) (2,290) $ (1) (2,291)
Ending Balance at Jun. 30, 2021 $ 3 90,923   (79,185) 11,741   11,741
Ending Balances (in shares) at Jun. 30, 2021 31,479            
Shares issued upon exercise of options ($1.90 per share)   10     10   10
Shares issued upon exercise of options ($1.90 per share) (in shares) 5            
Shares issued upon exercise of options ($1.21 per share)   79     79   79
Shares issued upon exercise of options ($1.21 per share) (in shares) 65            
Shares issued upon exercise of options ($0.89 per share)   19     19   19
Shares issued upon exercise of options ($0.89 per share) (in shares) 22            
Shares Issued For Services ($2.33 per share)   9     9   9
Shares issued for services ($2.33 per share) (in shares) 4            
Net reversal of share based compensation   (85)     (85)   (85)
Net loss       (2,353) (2,353)   (2,353)
Ending Balance at Sep. 30, 2021 $ 3 90,955   (81,538) 9,420   9,420
Ending Balances (in shares) at Sep. 30, 2021 31,575            
Beginning Balance at Dec. 31, 2021 $ 3 91,035 $ 9 (82,765) 8,282   8,282
Beginning Balances (in shares) at Dec. 31, 2021 31,582            
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            
Share based compensation   80     80   80
Share based compensation (in shares) 3            
Shares issued through the use of At-The Market issuance   578     578   578
Shares issued through the use of At-The Market issuance (in shares) 496            
Shares issued upon exercise of options ($0.89 per share) (in shares) 1            
Shares issued upon exercise of options ($2.93 per share) (in shares) 3            
Fair value of stock options granted in payment of accrued compensation   12     12   12
Shares issued for services ($1.93 per share)   7     7   7
Shares issued for services ($1.93 per share) (in shares) 4            
Net loss       (1,490) (1,490)   (1,490)
Ending Balance at Mar. 31, 2022 $ 3 91,807 9 (84,255) 7,564   7,564
Ending Balances (in shares) at Mar. 31, 2022 32,155            
Beginning Balance at Dec. 31, 2021 $ 3 91,035 9 (82,765) 8,282   8,282
Beginning Balances (in shares) at Dec. 31, 2021 31,582            
Net loss             (4,440)
Ending Balance at Sep. 30, 2022 $ 4 98,008 (11) (87,205) 10,796   10,796
Ending Balances (in shares) at Sep. 30, 2022 38,020            
Beginning Balance at Mar. 31, 2022 $ 3 91,807 9 (84,255) 7,564   7,564
Beginning Balances (in shares) at Mar. 31, 2022 32,155            
Share based compensation   50     50   50
Shares issued through the use of At-The Market issuance   9     9   9
Shares issued through the use of At-The Market issuance (in shares) 5            
Shares issued for services ($1.93 per share)   7     7   7
Shares issued for services ($1.93 per share) (in shares) 4            
Shares issued in stock/rights offering $ 1 4,210     4,211   4,211
Shares issued in stock/rights offering (in shares) 4,186            
Foreign-Exchange Translation Adjustment     (10)   (10)   (10)
Net loss       (1,638) (1,638)   (1,638)
Ending Balance at Jun. 30, 2022 $ 4 96,083 (1) (85,893) 10,193   10,193
Ending Balances (in shares) at Jun. 30, 2022 36,350            
Share based compensation   177     177   177
Share based compensation (in shares) 64            
Shares issued upon cashless exercise of options ($0.89 per share) (in shares) 10            
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            
Shares issued for services ($1.93 per share)   7     7   7
Shares issued for services ($1.93 per share) (in shares) 4            
Foreign-Exchange Translation Adjustment     (10)   (10)   (10)
Net loss       (1,312) (1,312)   (1,312)
Ending Balance at Sep. 30, 2022 $ 4 $ 98,008 $ (11) $ (87,205) $ 10,796   $ 10,796
Ending Balances (in shares) at Sep. 30, 2022 38,020