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Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (202,799)	$ (142,978)	$ (85,178)
Accretion of redeemable convertible preferred stock		(132,750)	(13,036)
Net loss attributable to common stockholders	$ (202,799)	$ (275,728)	$ (98,214)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted	73,345,569	8,605,962	8,540,778
Net loss per share attributable to common stockholders, basic and diluted	$ (2.76)	$ (32.04)	$ (11.50)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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