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Consolidated Statements of Stockholder's Equity (Unaudited) - USD ($) $ in Thousands | Total | June 2018 Public Offering [Member] | LPC [Member] | Common stock [Member] | Common stock [Member] June 2018 Public Offering [Member] | Common stock [Member] LPC [Member] | Preferred stock [Member] | Preferred stock [Member] June 2018 Public Offering [Member] | Additional paid-in capital [Member] | Additional paid-in capital [Member] June 2018 Public Offering [Member] | Additional paid-in capital [Member] LPC [Member] | Accumulated other comprehensive income (loss) [Member] | Accumulated deficit [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 7,879 |  |  | $ 12 |  |  |  |  | $ 20,556 |  |  | $ 5 | $ (12,694)
Beginning Balance, Shares at Dec. 31, 2017 |  |  |  | 1,194,793 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 181 |  |  |  |  |  |  |  | 181 |  |  |  |
Shares issued |  |  | $ 1,104 |  |  | $ 1 |  |  |  |  | $ 1,103 |  |
Shares issued, Shares |  |  |  |  |  | 80,000 |  |  |  |  |  |  |
Net loss | (3,022) |  |  |  |  |  |  |  |  |  |  |  | (3,022)
Ending Balance at Mar. 31, 2018 | 6,142 |  |  | $ 13 |  |  |  |  | 21,840 |  |  | 5 | (15,716)
Ending Balance, Shares at Mar. 31, 2018 |  |  |  | 1,274,793 |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 7,879 |  |  | $ 12 |  |  |  |  | 20,556 |  |  | 5 | (12,694)
Beginning Balance, Shares at Dec. 31, 2017 |  |  |  | 1,194,793 |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 5,340 |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (9,050) |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 14,164 |  |  | $ 16 |  |  |  |  | 35,887 |  |  | 5 | (21,744)
Ending Balance, Shares at Sep. 30, 2018 |  |  |  | 4,901,095 |  |  | 652 |  |  |  |  |  |
Beginning Balance at Mar. 31, 2018 | 6,142 |  |  | $ 13 |  |  |  |  | 21,840 |  |  | 5 | (15,716)
Beginning Balance, Shares at Mar. 31, 2018 |  |  |  | 1,274,793 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 197 |  |  |  |  |  |  |  | 197 |  |  |  |
Shares issued |  | $ 12,194 | 174 |  | $ 1 |  |  |  |  | $ 12,193 | 174 |  |
Shares issued, Shares |  |  |  |  | 1,160,500 | 16,000 |  | 9,158 |  |  |  |  |
Shares issued on conversion of preferred shares | 3 |  |  | $ 1 |  |  |  |  | 2 |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  | 1,656,750 |  |  | (6,627) |  |  |  |  |  |
Shares issued on exercise of warrants | 520 |  |  |  |  |  |  |  | 520 |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  | 130,500 |  |  |  |  |  |  |  |  |
Adjustment of fractional shares on reverse stock split, Shares |  |  |  | (17) |  |  |  |  |  |  |  |  |
Net loss | (2,788) |  |  |  |  |  |  |  |  |  |  |  | (2,788)
Ending Balance at Jun. 30, 2018 | $ 16,442 |  |  | $ 15 |  |  |  |  | 34,926 |  |  | 5 | (18,504)
Ending Balance, Shares at Jun. 30, 2018 |  |  |  | 4,238,526 |  |  | 2,531 |  |  |  |  |  |
Restricted stock unit settlements, Shares | 5,340 |  |  | 5,319 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 210 |  |  |  |  |  |  |  | 210 |  |  |  |
Shares issued |  |  | 2 |  |  |  |  |  |  |  | 2 |  |
Shares issued on conversion of preferred shares | (4) |  |  | $ 1 |  |  |  |  | (5) |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  | 469,750 |  |  | (1,879) |  |  |  |  |  |
Shares issued on exercise of warrants | 754 |  |  |  |  |  |  |  | 754 |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  | 187,500 |  |  |  |  |  |  |  |  |
Net loss | (3,240) |  |  |  |  |  |  |  |  |  |  |  | (3,240)
Ending Balance at Sep. 30, 2018 | 14,164 |  |  | $ 16 |  |  |  |  | 35,887 |  |  | 5 | (21,744)
Ending Balance, Shares at Sep. 30, 2018 |  |  |  | 4,901,095 |  |  | 652 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 15,802 |  |  | $ 18 |  |  |  |  | 41,161 |  |  | 4 | (25,381)
Beginning Balance, Shares at Dec. 31, 2018 |  |  |  | 6,721,117 |  |  | 579 |  |  |  |  |  |
Restricted stock unit settlements, Shares |  |  |  | 83 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 290 |  |  |  |  |  |  |  | 290 |  |  |  |
Adjustments to final October 2018 financing costs | 4 |  |  |  |  |  |  |  | 4 |  |  |  |
Cumulative adjustment on adoption of lease standard | ASU 2016-02 [Member] | (3) |  |  |  |  |  |  |  |  |  |  |  | (3)
Net loss | (5,904) |  |  |  |  |  |  |  |  |  |  |  | (5,904)
Ending Balance at Mar. 31, 2019 | 10,189 |  |  | $ 18 |  |  |  |  | 41,455 |  |  | 4 | (31,288)
Ending Balance, Shares at Mar. 31, 2019 |  |  |  | 6,721,200 |  |  | 579 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 15,802 |  |  | $ 18 |  |  |  |  | 41,161 |  |  | 4 | (25,381)
Beginning Balance, Shares at Dec. 31, 2018 |  |  |  | 6,721,117 |  |  | 579 |  |  |  |  |  |
Restricted stock unit settlements, Shares | 5,134 |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (13,201) |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 8,141 |  |  | $ 19 |  |  |  |  | 50,628 |  |  | 4 | (42,510)
Ending Balance, Shares at Sep. 30, 2019 |  |  |  | 8,102,764 |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2019 | 10,189 |  |  | $ 18 |  |  |  |  | 41,455 |  |  | 4 | (31,288)
Beginning Balance, Shares at Mar. 31, 2019 |  |  |  | 6,721,200 |  |  | 579 |  |  |  |  |  |
Stock-based compensation expense | 317 |  |  |  |  |  |  |  | 317 |  |  |  |
Shares issued |  |  | $ 423 |  |  |  |  |  |  |  | $ 423 |  |
Shares issued, Shares |  |  |  |  |  | 124,000 |  |  |  |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  | 144,750 |  |  | (579) |  |  |  |  |  |
Shares issued on exercise of warrants | 4,199 |  |  | $ 1 |  |  |  |  | 4,198 |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  | 1,107,813 |  |  |  |  |  |  |  |  |
Issuance of inducement warrants |  |  |  |  |  |  |  |  | 3,925 |  |  |  | (3,925)
Net loss | (3,624) |  |  |  |  |  |  |  |  |  |  |  | (3,624)
Ending Balance at Jun. 30, 2019 | $ 11,504 |  |  | $ 19 |  |  |  |  | 50,318 |  |  | 4 | (38,837)
Ending Balance, Shares at Jun. 30, 2019 |  |  |  | 8,097,763 |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 5,134 |  |  | 5,001 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 310 |  |  |  |  |  |  |  | 310 |  |  |  |
Net loss | (3,673) |  |  |  |  |  |  |  |  |  |  |  | (3,673)
Ending Balance at Sep. 30, 2019 | $ 8,141 |  |  | $ 19 |  |  |  |  | $ 50,628 |  |  | $ 4 | $ (42,510)
Ending Balance, Shares at Sep. 30, 2019 |  |  |  | 8,102,764 |  |  |  |  |  |  |  |  |

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