Summary of Significant Accounting Policies - Summary of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss	$ (6,334)	$ (4,163)	$ (15,106)	$ (11,953)
Accretion of redeemable convertible preferred stock		(79)	(115)	(234)
Net loss attributable to common stockholders	$ (6,334)	$ (4,242)	$ (15,221)	$ (12,187)
Denominator:
Weighted-average common shares outstanding—basic and diluted	12,924,682	220,902	7,133,967	192,433
Net loss per share attributable to common stockholders—basic and diluted	$ (0.49)	$ (19.20)	$ (2.13)	$ (63.33)