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v3.20.1

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive loss | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 2 | $ 183,224 | $ (171,434) |  | $ 11,792
Balance (in shares) at Dec. 31, 2017 | 2,364,526 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Issuance of common stock and warrants in public offering, net of issuance costs | $ 4 | 38,882 |  |  | 38,886
Issuance of common stock and warrants in public offering, net of issuance costs (in shares) | 4,200,000 |  |  |  |
Issuance of common stock for at-the-market offerings | $ 1 | 8,362 |  |  | 8,363
Issuance of common stock for at-the-market offerings (in shares) | 577,195 |  |  |  |
Proceeds from exercises of common stock options |  | 4 |  |  | 4
Proceeds from exercises of common stock options (in shares) | 291 |  |  |  |
Stock-based compensation expense |  | 1,771 |  |  | 1,771
Fractional shares eliminated pursuant to reverse stock split | (16) |  |  |  |
Unrealized losses on short-term investments |  |  |  | $ (4) | (4)
Net loss |  |  | (25,870) |  | (25,870)
Balance at Dec. 31, 2018 | $ 7 | 232,243 | (197,304) | (4) | $ 34,942
Balance (in shares) at Dec. 31, 2018 | 7,141,996 |  |  |  | 7,141,996
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Issuance of common stock and warrants in public offering, net of issuance costs | $ 4 | 18,501 |  |  | $ 18,505
Issuance of common stock and warrants in public offering, net of issuance costs (in shares) | 4,000,000 |  |  |  |
Issuance of common stock for at-the-market offerings | $ 1 | 6,995 |  |  | 6,996
Issuance of common stock for at-the-market offerings (in shares) | 1,282,904 |  |  |  |
Proceeds from exercises of common stock options |  | 54 |  |  | $ 54
Proceeds from exercises of common stock options (in shares) | 8,700 |  |  |  | 0
Stock-based compensation expense |  | 1,512 |  |  | $ 1,512
Unrealized losses on short-term investments |  |  |  | $ 4 | 4
Net loss |  |  | (26,293) |  | (26,293)
Balance at Dec. 31, 2019 | $ 12 | $ 259,305 | $ (223,597) |  | $ 35,720
Balance (in shares) at Dec. 31, 2019 | 12,433,600 |  |  |  | 12,433,600

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