Earnings Per Common Share ("EPS") - Components of Basic and Diluted EPS Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
EPS — basic and diluted:
Net loss (numerator)	$ (29,023)	$ (25,998)	$ (35,523)	$ (12,916)	$ (55,021)	$ (48,439)
Weighted average common shares (denominator), Basic	253,644		249,295		252,775	247,970
Weighted average common shares (denominator), Diluted	253,644		249,295		252,775	247,970
Net loss per share, Basic	$ (0.11)		$ (0.14)		$ (0.22)	$ (0.20)
Net loss per share, Diluted	$ (0.11)		$ (0.14)		$ (0.22)	$ (0.20)