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Net Loss Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Numerator: |  |
Net loss | $ (27,514) | $ (32,900)
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 diluted loss per share | $ (37,588) | $ (33,259)
Denominator: |  |
Weighted average number of common shares outstanding - basic and diluted (in shares) | 59,327,713 | 22,582,687
Net loss per share attributable to common stockholders - basic and diluted (in dollars per share) | $ (0.63) | $ (1.47)
Exercise of the pre-funded warrants and penny warrants | 16,718,418 |

X
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