Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss	$ (11,651)	$ (4,105)	$ (11,609)	$ (7,978)	$ (23,260)	$ (12,084)
Dividends on convertible preferred stock	(2,713)	(1,401)			(7,648)	(4,159)
Net loss attributable to common stockholders	$ (14,364)	$ (5,506)			$ (30,908)	$ (16,243)
Net loss per common share, basic and diluted	$ (55.25)	$ (21.18)			$ (118.89)	$ (62.48)
Weighted-average number of shares used in computing net loss per common share, basic and diluted	259,966	259,966			259,966	259,966