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, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
EPS — basic and diluted:
Net loss (numerator)	$ (5,265)	$ (9,795)	$ (29,023)	$ (25,998)	$ (15,060)	$ (55,021)
Weighted average common shares (denominator), Basic	265,626		253,644		264,802	252,775
Weighted average common shares (denominator), Diluted	265,626		253,644		264,802	252,775
Net loss per share, Basic	$ (0.02)		$ (0.11)		$ (0.06)	$ (0.22)
Net loss per share, Diluted	$ (0.02)		$ (0.11)		$ (0.06)	$ (0.22)