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Consolidated Statements of Stockholder's Equity (Unaudited) - USD ($) $ in Thousands | Total | LPC [Member] | December 2019 Financing [Member] | October 2018 Financing [Member] | Common stock [Member] | Common stock [Member] Series B Convertible Preferred Stock [Member] | Preferred stock [Member] | Preferred stock [Member] Series B Convertible Preferred Stock [Member] | Additional paid-in capital [Member] | Additional paid-in capital [Member] Series B Convertible Preferred Stock [Member] | Additional paid-in capital [Member] LPC [Member] | Additional paid-in capital [Member] December 2019 Financing [Member] | Additional paid-in capital [Member] October 2018 Financing [Member] | Accumulated other comprehensive income (loss) [Member] | Accumulated deficit [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 | 133 |  |  |  | 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, 2019 | $ 18,050 |  |  |  | $ 41 |  |  |  | 63,709 |  |  |  |  | 4 | (45,704)
Beginning Balance, Shares at Dec. 31, 2019 |  |  |  |  | 29,485,178 |  | 1,121 |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 302 |  |  |  |  |  |  |  | 302 |  |  |  |  |  |
Costs relating to financing and purchase agreement |  | $ (13) | $ (34) |  |  |  |  |  |  |  | $ (13) | $ (34) |  |  |
Shares issued on conversion of preferred shares |  |  |  |  |  | $ 2 |  |  |  | $ (2) |  |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  |  |  | 1,867,586 |  | (1,121) |  |  |  |  |  |  |
Net loss | (3,320) |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,320)
Ending Balance at Mar. 31, 2020 | $ 14,985 |  |  |  | $ 43 |  |  |  | $ 63,962 |  |  |  |  | $ 4 | $ (49,024)
Ending Balance, Shares at Mar. 31, 2020 |  |  |  |  | 31,352,764 |  |  |  |  |  |  |  |  |  |

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