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Net Loss Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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

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