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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (CAPITAL DEFICIENCY) - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 15 | $ 270,492 | $ (340,829) | $ (70,322)
Beginning balance (in shares) at Dec. 31, 2019 | 14,838,213 |  |  |
Issuance of common stock and warrants, net of issuance cost | $ 18 | 41,325 |  | 41,343
Issuance of common stock and warrants, net of issuance cost (in shares) | 17,604,423 |  |  |
Note receivable from issuance of common stock and warrants |  | (4,000) |  | (4,000)
Share-based compensation related to stock options |  | 431 |  | 431
Net (loss) income for the period |  |  | 1,667 | 1,667
Ending balance at Mar. 31, 2020 | $ 33 | 308,248 | (339,162) | (30,881)
Ending balance (in shares) at Mar. 31, 2020 | 32,442,636 |  |  |
Beginning balance at Dec. 31, 2020 | $ 35 | 320,280 | (347,352) | (27,037)
Beginning balance (in shares) at Dec. 31, 2020 | 34,765,280 |  |  |
Issuance of common stock, net of issuance cost | $ 9 | 37,616 |  | 37,625
Issuance of common stock, net of issuance cost (in shares) | 8,749,999 |  |  |
Issuance of common stock under the Sales Agreement, net | $ 2 | 8,573 |  | 8,575
Issuance of common stock under the Sales Agreement, net (in shares) | 1,867,552 |  |  |
Share-based compensation related to stock options |  | 510 |  | 510
Share-based compensation related to restricted stock awards |  | 306 |  | 306
Net (loss) income for the period |  |  | (5,475) | (5,475)
Ending balance at Mar. 31, 2021 | $ 46 | $ 367,285 | $ (352,827) | $ 14,504
Ending balance (in shares) at Mar. 31, 2021 | 45,382,831 |  |  |

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