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Net Loss Per Share Attributable to Common Stockholders - Schedule of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (27,531)	$ (37,037)
Cumulative dividends on convertible preferred stock	(7,189)	(7,055)
Net loss attributable to common stockholders	$ (34,720)	$ (44,092)
Net loss per common share—basic and diluted	$ (5.25)	$ (33.41)
Weighted-average number of shares outstanding used in computing net loss per common share—basic and diluted	6,618,445	1,319,912

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