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Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (52,412)	$ (75,305)
Deemed dividend resulting from extinguishment upon modification of Series C preferred stock	177,789
Net loss attributable to common stockholders	$ (230,201)	$ (75,305)
Net loss attributable to common stockholders per share, basic and diluted	$ (5.40)	$ (21.82)
Weighted average shares of common stock, basic and diluted	42,619,582	3,450,500

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