Description of Business and Summary of Significant Accounting Policies - Schedule of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net loss attributable to common stockholders	$ (8,845)	$ (8,266)	$ (9,706)	$ (9,601)	$ (6,856)	$ (7,744)	$ (26,817)	$ (24,201)
Denominator
Weighted-average shares outstanding, basic and diluted	277			244			269	233
Net loss per share, basic and diluted	$ (31.93)			$ (39.35)			$ (99.69)	$ (103.87)