Loss per Share - Schedule of Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Loss Per Share [Abstract]
Basic loss per share, net loss	$ (44,884)	$ (56,519)
Diluted loss per share, net loss	$ (44,884)	$ (56,519)
Basic loss per share, Shares	78,458	78,213
Diluted loss per share, Shares	78,458	78,213
Basic loss per share, Per Share Amount	$ (0.57)	$ (0.72)
Diluted loss per share, Per Share Amount	$ (0.57)	$ (0.72)