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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Comprehensive Deficit [Member]
--- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2017 | $ 4,567 |  | $ 14 | $ 237,486 | $ (232,933)
BALANCE, Shares at Dec. 31, 2017 |  | 6,000 |  |  |
BALANCE, Shares at Dec. 31, 2017 |  |  | 14,269,000 |  |
Non-cash compensation recognized on stock options and ESPP | 36 |  |  | 36 |
Restricted stock grants, net of cancellations | 899 |  | $ 1 | 898 |
Restricted stock grants, net of cancellations, shares |  |  | 1,124,000 |  |
Cancellation of shares for payment of withholding tax | (209) |  |  | (209) |
Cancellation of shares for payment of withholding tax, shares |  |  | (94,000) |  |
Employee stock purchase plan | 5 |  |  | 5 |
Employee stock purchase plan, shares |  |  | 5,000 |  |
Preferred shares converted to common shares |  |  | $ 4 | (4) |
Preferred shares converted to common shares, shares |  | (5,000) | 3,645,000 |  |
Common shares issued in stock offering, net of offering costs | 17,600 |  | $ 9 | 17,591 |
Common shares issued in stock offering, net offering costs, shares |  |  | 9,267,000 |  |
Issuance of warrants in stock offering | (6,792) |  |  | (6,792) |
Exercise of common stock warrants, shares |  |  | 26,000 |  |
Reclassification of warrants previously classified as liabilities to equity | 7,604 |  |  | 7,604 |
Warrant repricing |  |  |  | 11 | (11)
Canadian tax adjustments from prior period | (2) |  |  |  | (2)
Preferred stock dividends | (404) |  |  |  | (404)
Comprehensive loss | (2,741) |  |  |  | (2,741)
BALANCE at Dec. 31, 2018 | $ 20,563 |  | $ 28 | 256,626 | (236,091)
BALANCE, Shares at Dec. 31, 2018 | 1,345 | 1,000 |  |  |
BALANCE, Shares at Dec. 31, 2018 | 28,241,129 |  | 28,242,000 |  |
Non-cash compensation recognized on stock options and ESPP | $ 43 |  |  | 43 |
Restricted stock grants, net of cancellations | 1,451 |  | $ 1 | 1,450 |
Restricted stock grants, net of cancellations, shares |  |  | 1,225,000 |  |
Cancellation of shares for payment of withholding tax | (701) |  |  | (701) |
Cancellation of shares for payment of withholding tax, shares |  |  | (214,000) |  |
Employee stock purchase plan | 10 |  |  | 10 |
Employee stock purchase plan, shares |  |  | 4,000 |  |
Preferred shares converted to common shares |  |  | $ 1 | (1) |
Preferred shares converted to common shares, shares |  | (1,000) | 1,180,000 |  |
Common shares issued in stock offering, net of offering costs | (14) |  |  | (14) |
Common shares issued in connection with Smart Retail acquisition, net | 5,129 |  | $ 3 | 5,126 |
Common shares issued in connection, with Smart Retail acquisition, net, shares |  |  | 2,699,000 |  |
Exercise of common stock warrants | 11,457 |  | $ 5 | 11,452 |
Exercise of common stock warrants, shares |  |  | 5,327,000 |  |
Exercise of stock options | $ 50 |  |  | 50 |
Exercise of stock options, shares | 13,000 |  | 13,000 |  |
Preferred stock dividends | $ (119) |  |  |  | (119)
Cumulative effect of adoption of ASC 842 | 93 |  |  |  | 93
Comprehensive loss | 10,722 |  |  |  | 10,722
BALANCE at Dec. 31, 2019 | $ 48,684 |  | $ 38 | $ 274,041 | $ (225,395)
BALANCE, Shares at Dec. 31, 2019 | 0 |  |  |  |
BALANCE, Shares at Dec. 31, 2019 | 38,475,084 |  | 38,476,000 |  |

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