Income (Loss) Per Share - Computation of Basic and Diluted Income (Loss) Per Share (Parenthetical) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Dilutive securities (in shares)	0	0	0	0