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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 4 | $ 195,666 | $ (186,857) | $ 8,813
Balance, shares at Dec. 31, 2018 | 3,856,768 |  |  |
Stock-based compensation |  | 316 |  | 316
Stock-based compensation, shares | 74 |  |  |
Issuance of common stock from exercise of warrants |  | 1,504 |  | 1,504
Issuance of common stock from exercise of warrants, shares | 83,542 |  |  |
Sale of common stock, net of offering costs |  | 380 |  | 380
Sale of common stock, net of offering costs, shares | 30,817 |  |  |
Net loss |  |  | (5,670) | (5,670)
Balance at Mar. 31, 2019 | $ 4 | 197,866 | (192,527) | 5,343
Balance, shares at Mar. 31, 2019 | 3,971,201 |  |  |
Stock-based compensation |  | 277 |  | 277
Issuance of common stock from exercise of warrants |  |  |  |
Issuance of common stock from exercise of warrants, shares | 1,249 |  |  |
Sale of common stock and warrants, net of offering costs | $ 1 | 15,107 |  | 15,108
Sale of common stock and warrants, net of offering costs, shares | 1,428,667 |  |  |
Deemed dividend for warrant down-round protection provision |  | 1 | (1) |
Net loss |  |  | (5,027) | (5,027)
Balance at Jun. 30, 2019 | $ 5 | 213,251 | (197,555) | 15,701
Balance, shares at Jun. 30, 2019 | 5,401,117 |  |  |
Balance at Dec. 31, 2019 | $ 5 | 214,397 | (208,758) | 5,644
Balance, shares at Dec. 31, 2019 | 5,490,038 |  |  |
Stock-based compensation |  | 372 |  | 372
Sale of common stock, net of offering costs | $ 1 | 2,673 |  | 2,674
Sale of common stock, net of offering costs, shares | 337,944 |  |  |
Net loss |  |  | (5,670) | (5,670)
Balance at Mar. 31, 2020 | $ 6 | 217,442 | (214,428) | 3,020
Balance, shares at Mar. 31, 2020 | 5,827,982 |  |  |
Stock-based compensation |  | 210 |  | 210
Stock-based compensation, shares | 5,240 |  |  |
Issuance of common stock from exercise of pre-funded warrants | $ 1 | 3 |  | 4
Issuance of common stock from exercise of pre-funded warrants, shares | 1,200,000 |  |  |
Sale of common stock and pre-funded warrants, net of offering costs | $ 6 | 52,159 |  | 52,165
Sale of common stock and pre-funded warrants, net of offering costs, shares | 6,138,602 |  |  |
Deemed dividend for warrant down-round protection provision |  | 1 | (1) |
Net loss |  |  | (4,625) | (4,625)
Balance at Jun. 30, 2020 | $ 13 | $ 269,815 | $ (214,428) | $ 50,774
Balance, shares at Jun. 30, 2020 | 13,171,824 |  |  |

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