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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Series A Convertible Preferred Shares [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 21 | $ 74,766 | $ (26,631) | $ 48,156
Balance, shares at Dec. 31, 2017 |  | 20,877,893 |  |  |
Net proceeds from the issuance of common stock |  |  | 1 |  | 1
Net proceeds from the issuance of common stock, shares |  | 182,297 |  |  |
Net loss |  |  |  | (8,214) | (8,214)
Balance at Dec. 31, 2018 |  | $ 21 | 74,767 | (34,845) | 39,943
Balance, shares at Dec. 31, 2018 |  | 21,060,190 |  |  |
Net proceeds from the issuance of common stock |  |  | 274 |  | 274
Net proceeds from the issuance of common stock, shares |  | 214,828 |  |  |
Issuance of common stock under the promissory note |  |  | 113 |  | 113
Issuance of common stock under the promissory note, shares |  | 95,262 |  |  |
Net loss |  |  |  | (8,330) | (8,330)
Balance at Dec. 31, 2019 |  | $ 21 | 75,154 | (43,175) | 32,000
Balance, shares at Dec. 31, 2019 |  | 21,370,280 |  |  |
Impact of adoption of ASU 2016-13 new accounting standard for credit losses |  |  |  | (9) | (9)
Issuance of common stock under the promissory note |  |  | 226 |  | 226
Issuance of common stock under the promissory note, shares |  | 260,495 |  |  |
Issuance of Series A Convertible Preferred shares & Warrants |  |  | 4,313 |  | 4,313
Issuance of Series A Convertible Preferred shares & Warrants, shares | 200,000 |  |  |  |
Conversion of Series A Convertible Preferred shares to common stock |  | $ 1 | (1) |  |
Conversion of Series A Convertible Preferred shares to common stock, shares | (18,525) | 332,106 |  |  |
Series A Convertible Preferred Shares dividends |  |  |  | (71) | (71)
Net loss |  |  |  | (6,900) | (6,900)
Balance at Dec. 31, 2020 |  | $ 22 | $ 79,692 | $ (50,155) | $ 29,559
Balance, shares at Dec. 31, 2020 | 181,475 | 21,962,881 |  |  |

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