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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (40,642)	$ (31,403)
Weighted-average shares used in computing net loss per share	138,967,754	126,058,389
Net loss per share attributable to common shareholders, basic and diluted	$ (0.29)	$ (0.25)