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Statements Of Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 17 | $ 183,567 |  | $ (163,956) | $ 19,628
Balance, Shares at Dec. 31, 2018 | 17,219,300 |  |  |  |
Stock options for employees |  | 1,287 |  |  | 1,287
Stock options for non-employees |  | 9 |  |  | 9
Issuance costs from 2018 sale of common stock and warrants |  | (60) |  |  | (60)
Issuance of common stock pursuant to exercise of warrants | $ 5 | 5,861 |  |  | 5,866
Issuance of common stock pursuant to exercise of warrants, shares | 4,622,510 |  |  |  |
Net loss |  |  |  | (4,631) | (4,631)
Balance at Dec. 31, 2019 | $ 22 | 190,664 |  | (168,587) | 22,099
Balance, Shares at Dec. 31, 2019 | 21,841,810 |  |  |  |
Stock options for employees |  | 961 |  |  | 961
Stock options for non-employees |  | 27 |  |  | 27
Issuance of common stock pursuant to exercise of stock options |  | 256 |  |  | $ 256
Issuance of common stock pursuant to exercise of stock options, shares | 71,105 |  |  |  | 71,105
Issuance of common stock pursuant to exercise of warrants | $ 4 | 4,936 |  |  | $ 4,940
Issuance of common stock pursuant to exercise of warrants, shares | 3,950,072 |  |  |  |
Common stock issued in conjunction with follow-on public offering, net of issuance costs | $ 9 | 70,242 |  |  | 70,251
Common stock issued in conjunction with follow-on public offering, net of issuance costs, shares | 9,375,000 |  |  |  |
Net loss |  |  |  | (6,334) | (6,334)
Balance at Dec. 31, 2020 | $ 35 | $ 267,086 |  | $ (174,921) | $ 92,200
Balance, Shares at Dec. 31, 2020 | 35,237,987 |  |  |  |

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