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Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands | Total | Series A Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ (11,268) |  | $ 159 | $ 196,760 | $ (208,187)
Beginning Balance at Dec. 31, 2017 |  | $ 0 |  |  |
Beginning Balance, Shares at Dec. 31, 2017 |  |  | 24,571,029 |  |
Beginning Balance, Shares at Dec. 31, 2017 |  | 4,605 |  |  |
Stock-based compensation expense | 403 |  |  | 403 |
Exercise of common stock options | 2 |  |  | 2 |
Exercise of common stock options, Shares |  |  | 919 |  |
Issuance of common stock -net | 5,869 |  | $ 27 | 5,842 |
Issuance of common stock -net, Shares |  |  | 2,691,494 |  |
Fees related to issuance of common stock | (243) |  |  | (243) |
Conversion of convertible preferred stock, Shares |  | (3,204) | 1,423,970 |  |
Net loss | (14,833) |  |  |  | (14,833)
Ending Balance at Mar. 31, 2018 |  | $ 0 |  |  |
Ending Balance at Mar. 31, 2018 | (20,070) |  | $ 186 | 202,764 | (223,020)
Ending Balance,Shares at Mar. 31, 2018 |  | 1,401 |  |  |
Ending Balance, Shares at Mar. 31, 2018 |  |  | 28,687,412 |  |
Beginning Balance at Dec. 31, 2018 | (458) |  | $ 513 | 215,859 | (216,830)
Beginning Balance at Dec. 31, 2018 |  | $ 0 |  |  |
Beginning Balance, Shares at Dec. 31, 2018 |  |  | 62,025,398 |  |
Beginning Balance, Shares at Dec. 31, 2018 |  | 400 |  |  |
Stock-based compensation expense | 107 |  |  | 107 |
Exercise of warrants | 4,234 |  | $ 326 | 3,908 |
Exercise of warrants, Shares |  |  | 32,574,203 |  |
Net loss | (9,415) |  |  |  | (9,415)
Ending Balance at Mar. 31, 2019 |  | $ 0 |  |  |
Ending Balance at Mar. 31, 2019 | $ (5,532) |  | $ 839 | $ 219,874 | $ (226,245)
Ending Balance,Shares at Mar. 31, 2019 |  | 400 |  |  |
Ending Balance, Shares at Mar. 31, 2019 |  |  | 94,599,601 |  |

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