Basic and Diluted Net Loss Per Share (Parenthetical) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of net loss per share	9,700,000	9,000,000.0	9,100,000
2024 Convertible Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Conversion of shares excluded from computation of diluted EPS	7,763,552
Effect on diluted net earnings (loss) per share		$ 0