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Net Loss Per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Numerator:    
Net loss $ (40,587) $ (27,514)
Dividend attributable to down round feature of warrants   (303)
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 $ (40,587) $ (37,588)
Denominator:    
Net loss per share attributable to common stockholders - basic $ (0.47) $ (0.63)
Net loss per share attributable to common stockholders - Diluted $ (0.47) $ (0.63)
Weighted average number of common shares outstanding - basic 85,825,283 59,327,713
Weighted average number of common shares outstanding - Diluted 85,825,283 59,327,713
Exercise of the pre-funded warrants and penny warrants 24,930,483