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Consolidated Statements of Stockholders' Equity - USD ($) | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | ---
Balances at Dec. 31, 2016 | $ 2,244,000 | $ 1,000 | $ 42,574,000 | $ (40,331,000)
Balances (in shares) at Dec. 31, 2016 |  | 12,983,938 |  |
Shares issued in rights offering ($3.03 per share) | 7,258,000 | $ 1,000 | 7,257,000 | 0
Shares issued in rights offering ($3.03 per share) (in shares) |  | 2,395,471 |  |
Warrants issued in rights offering ($0.97 per warrant) | 2,324,000 | $ 0 | 2,324,000 | 0
Issuance costs of rights offering | (915,000) | 0 | (915,000) | 0
Shares issued in payment of accrued compensation ($3.60 per share) | 490,000 | $ 0 | 490,000 | 0
Shares issued in payment of accrued compensation ($3.60 per share) (in shares) |  | 136,110 |  |
Shares issued for services ($4.85 per share) | 24,000 | $ 0 | 24,000 | 0
Shares issued for services ($4.85 per share) (in shares) |  | 5,000 |  |
Shares issued for services ($3.50 per share) | 18,000 |  | 18,000 |
Shares issued for services ($3.50 per share) (in shares) |  | 5,000 |  |
Shares issued for 2017 board services ($3.60 per share) | 300,000 | $ 0 | 300,000 | 0
Shares issued for 2017 board services ($3.60 per share) (In shares) |  | 83,334 |  |
Share Based Compensation | 369,000 | $ 0 | 369,000 | 0
Net loss | (9,680,000) | 0 | 0 | (9,680,000)
Balances at Dec. 31, 2017 | 2,432,000 | $ 2,000 | 52,441,000 | (50,011,000)
Balances (in shares) at Dec. 31, 2017 |  | 15,608,853 |  |
Shares issued in stock offerings ($2.25 per share) | 24,668,000 | $ 1,000 | 24,667,000 | 0
Shares issued in stock offerings ($2.25 per share) (in shares) |  | 10,963,543 |  |
Issuance costs of rights offering | (1,157,000) | $ 0 | (1,157,000) | 0
Shares issued for services ($3.50 per share) | 26,000 | $ 0 | 26,000 | 0
Shares issued for services ($3.50 per share) (in shares) |  | 7,500 |  |
Shares issued for services ($1.44 per share) | 4,000 | $ 0 | 4,000 | 0
Shares issued for services ($1.44 per share) (in shares) |  | 2,500 |  |
Shares issued for 2018 board service ($1.85 per share) | 212,000 | $ 0 | 212,000 | 0
Shares issued for 2018 board service ($1.85 per share) (in shares) |  | 114,865 |  |
Share Based Compensation | 224,000 | $ 0 | 224,000 | 0
Net loss | (9,500,000) | 0 | 0 | (9,500,000)
Balances at Dec. 31, 2018 | $ 16,909,000 | $ 3,000 | $ 76,417,000 | $ (59,511,000)
Balances (in shares) at Dec. 31, 2018 |  | 26,697,261 |  |

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