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Net Loss Per Share Attributable to Common Shareholders - Computation of the Basic and Diluted Net Loss Per Share Attributable to Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (146,227)	$ (68,606)	$ (46,447)
Fair value adjustments to redemption value for Series E-1 convertible preferred stock options		(964)	102
Net loss attributable to common shareholders	$ (146,227)	$ (69,570)	$ (46,345)
Weighted-average shares used in computing net loss per share	131,216,468	69,165,315	12,629,778
Net loss per share attributable to common shareholders, basic and diluted	$ (1.11)	$ (1.01)	$ (3.67)

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