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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total ClearSign Technologies Corporation Stockholders' Equity
Noncontrolling Interest
Total
Balance at the beginning at Dec. 31, 2019 $ 3,000 $ 77,210,000 $ (67,990,000) $ 9,223,000 $ 3,000 $ 9,226,000
Balances (in shares) at Dec. 31, 2019 26,707,261          
Shares issued for services ($1.03 per share) $ 0 2,000 0 2,000 0 2,000
Shares issued for services ($1.03 per share) (in shares) 2,500          
Fair value of stock options issued for board service $ 0 53,000 0 53,000 0 53,000
Fair value of stock issued in payment of accrued compensation 0 215,000 0 215,000 0 215,000
Share based compensation 0 80,000 0 80,000 0 80,000
Net loss 0 0 (1,963,000) (1,963,000) 0 (1,963,000)
Balance at the end at Mar. 31, 2020 $ 3,000 77,560,000 (69,953,000) 7,610,000 3,000 7,613,000
Balances (in shares) at Mar. 31, 2020 26,709,761          
Balance at the beginning at Dec. 31, 2019 $ 3,000 77,210,000 (67,990,000) 9,223,000 3,000 9,226,000
Balances (in shares) at Dec. 31, 2019 26,707,261          
Net loss           (5,031,000)
Balance at the end at Sep. 30, 2020 $ 3,000 83,986,000 (73,020,000) 10,969,000 2,000 10,971,000
Balances (in shares) at Sep. 30, 2020 30,043,186          
Balance at the beginning at Mar. 31, 2020 $ 3,000 77,560,000 (69,953,000) 7,610,000 3,000 7,613,000
Balances (in shares) at Mar. 31, 2020 26,709,761          
Shares issued for services ($1.03 per share) $ 0 3,000 0 3,000 0 3,000
Shares issued for services ($1.03 per share) (in shares) 2,500          
Shares issued upon exercise of options ($1.90 per share) $ 0 10,000 0 10,000 0 10,000
Shares issued upon exercise of options ($1.90 per share) (in shares) 5,000          
Shares issued upon exercise of options ($0.89 per share) $ 0 12,000 0 12,000 0 12,000
Shares issued upon exercise of options ($0.89 per share) (in shares) 14,000          
Fair value of stock options issued for board service $ 0 34,000 0 34,000 0 34,000
Share based compensation 0 61,000 0 61,000 0 61,000
Net loss 0 0 (1,390,000) (1,390,000) (1,000) (1,391,000)
Balance at the end at Jun. 30, 2020 $ 3,000 77,680,000 (71,343,000) 6,340,000 2,000 6,342,000
Balances (in shares) at Jun. 30, 2020 26,731,261          
Shares issued for services ($1.03 per share) $ 0 3,000 0 3,000   3,000
Shares issued for services ($1.03 per share) (in shares) 2,500          
Shares issued upon exercise of options ($0.89 per share) $ 0 2,000 0 2,000   2,000
Shares issued upon exercise of options ($0.89 per share) (in shares) 2,500          
Shares issued upon exercise of options ($1.00 per share) $ 0 65,000 0 65,000   65,000
Shares issued upon exercise of options ($1.00 per share) (in shares) 65,000          
Fair value of stock options issued for board service $ 0 122,000 0 122,000   122,000
Share based compensation 0 61,000 0 61,000   61,000
Secondary offering ($2 per share) $ 0 6,053,000 0 6,053,000   6,053,000
Secondary offering ($2 per share) (in shares) 3,241,925          
Net loss $ 0 0 (1,677,000) (1,677,000)   (1,677,000)
Balance at the end at Sep. 30, 2020 $ 3,000 83,986,000 (73,020,000) 10,969,000 2,000 10,971,000
Balances (in shares) at Sep. 30, 2020 30,043,186          
Balance at the beginning at Dec. 31, 2020 $ 3,000 84,411,000 (74,874,000) 9,540,000 1,000 9,541,000
Balances (in shares) at Dec. 31, 2020 30,077,436          
Shares issued upon exercise of options ($1.90 per share) $ 0 2,000 0 2,000 0 2,000
Shares issued upon exercise of options ($1.90 per share) (in shares) 1,250          
Shares issued upon exercise of options ($3.80 per share) $ 0 36,000 0 36,000 0 36,000
Shares issued upon exercise of options ($3.80 per share) (in shares) 9,375          
Shares issued upon exercise of options ($1.21 per share) $ 0 4,000 0 4,000   4,000
Shares issued upon exercise of options ($1.21 per share) (in shares) 3,000          
Shares issued upon exercise of warrants ($1.80 per share) $ 0 67,000 0 67,000 0 67,000
Shares issued upon exercise of warrants ($1.80 per share) (in shares) 37,500          
Fair value of stock options issued for board service $ 0 210,000 0 210,000 0 210,000
Fair value of stock issued in payment of accrued compensation $ 0 217,000 0 217,000 0 217,000
Fair value of stock issued in payment of accrued compensation (in shares) 64,439          
Share based compensation $ 0 410,000 0 410,000 0 410,000
Shares issued through the use of At-The Market issuance $ 0 4,469,000 0 4,469,000 0 4,469,000
Shares issued through the use of At-The Market issuance (in shares) 940,748          
Proceeds receivable from At-The Market issuance $ 0 (1,076,000) 0 (1,076,000) 0 (1,076,000)
Shares issued for services ($2.33 per share) $ 0 9,000 0 9,000 0 9,000
Shares issued for services ($2.33 per share) (in Shares) 3,750          
Net loss $ 0 0 (2,021,000) (2,021,000) 0 (2,021,000)
Balance at the end at Mar. 31, 2021 $ 3,000 88,759,000 (76,895,000) 11,867,000 1,000 11,868,000
Balances (in shares) at Mar. 31, 2021 31,137,498          
Balance at the beginning at Dec. 31, 2020 $ 3,000 84,411,000 (74,874,000) 9,540,000 1,000 9,541,000
Balances (in shares) at Dec. 31, 2020 30,077,436          
Net loss           (6,665,000)
Balance at the end at Sep. 30, 2021 $ 3,000 90,955,000 (81,538,000) 9,420,000 0 9,420,000
Balances (in shares) at Sep. 30, 2021 31,574,704          
Balance at the beginning at Mar. 31, 2021 $ 3,000 88,759,000 (76,895,000) 11,867,000 1,000 11,868,000
Balances (in shares) at Mar. 31, 2021 31,137,498          
Shares issued upon exercise of options ($1.21 per share) $ 0 72,000 0 72,000 0 72,000
Shares issued upon exercise of options ($1.21 per share) (in shares) 94,660          
Shares issued upon exercise of options ($3.10 per share) $ 0 54,000 0 54,000 0 54,000
Shares issued upon exercise of options ($3.10 per share) (in shares) 17,378          
Shares issued upon exercise of options ($0.89 per share) $ 0 36,000 0 36,000 0 36,000
Shares issued upon exercise of options ($0.89 per share) (in shares) 42,316          
Shares issued upon exercise of options ($1.85 per share) $ 0 6,000 0 6,000 0 6,000
Shares issued upon exercise of options ($1.85 per share) (in shares) 3,200          
Shares issued upon exercise of options ($0.98 per share) $ 0 0 0 0 0 0
Shares issued upon exercise of options ($0.98 per share) (in shares) 22,648          
Shares issued upon exercise of options ($2.93 per share) $ 0 0 0 0 0 0
Shares issued upon exercise of options ($2.93 per share) (in shares) 6,182          
Fair value of stock options issued for board service $ 0 52,000 0 52,000 0 52,000
Share based compensation 0 19,000 0 19,000 0 19,000
Shares issued through the use of At-The Market issuance $ 0 1,916,000 0 1,916,000 0 1,916,000
Shares issued through the use of At-The Market issuance (in shares) 151,822          
Shares issued for services ($2.33 per share) $ 0 9,000 0 9,000 0 9,000
Shares issued for services ($2.33 per share) (in Shares) 3,750          
Net loss $ 0 0 (2,290,000) (2,290,000) (1,000) (2,291,000)
Balance at the end at Jun. 30, 2021 $ 3,000 90,923,000 (79,185,000) 11,741,000 0 11,741,000
Balances (in shares) at Jun. 30, 2021 31,479,454          
Shares issued upon exercise of options ($1.90 per share) $ 0 10,000 0 10,000 0 10,000
Shares issued upon exercise of options ($1.90 per share) (in shares) 5,000          
Shares issued upon exercise of options ($1.21 per share) $ 0 79,000 0 79,000 0 79,000
Shares issued upon exercise of options ($1.21 per share) (in shares) 65,000          
Shares issued upon exercise of options ($0.89 per share) $ 0 19,000 0 19,000 0 19,000
Shares issued upon exercise of options ($0.89 per share) (in shares) 21,500          
Shares issued for services ($2.33 per share) $ 0 9,000 0 9,000 0 9,000
Shares issued for services ($2.33 per share) (in Shares) 3,750          
Net reversal of share based compensation (Note 6) $ 0 (85,000) 0 (85,000) 0 (85,000)
Net loss 0 0 (2,353,000) (2,353,000) 0 (2,353,000)
Balance at the end at Sep. 30, 2021 $ 3,000 $ 90,955,000 $ (81,538,000) $ 9,420,000 $ 0 $ 9,420,000
Balances (in shares) at Sep. 30, 2021 31,574,704