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Net Loss Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Numerator: |  |  |  |
Net loss | $ (7,057) | $ (7,935) | $ (20,804) | $ (24,904)
Dividend attributable to down round feature of warrants |  |  | (303) | (359)
Dividend attributable to Series A & B convertible preferred stock |  |  | (372) |
Series A & B convertible preferred stock - beneficial conversion feature |  |  | (9,399) |
Net loss attributable to common stockholders for basic and diluted loss per share | $ (7,057) | $ (7,935) | $ (30,878) | $ (25,263)
Denominator: |  |  |  |
Weighted average number of common shares outstanding - basic and diluted (in shares) | 76,321,644 | 23,923,196 | 53,548,902 | 22,039,386
Net loss per share attributable to common stockholders - basic and diluted (in dollars per share) | $ (0.09) | $ (0.33) | $ (0.58) | $ (1.15)
Exercise of the pre-funded warrants |  |  | 16,663,902 |

X
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