Net Income (Loss) Per Share of Common Stock - Shares Excluded from Calculation of Diluted Net Income (Loss) per Share (Detail) - shares shares in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount		237.8	110.8
Stock Options and Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount		23.4	29.0
RSUs [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount		64.4	64.8
Convertible Senior Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	[1]	150.0	17.0

[1] The amount shown for three months ended March 31, 2022 reflects the adoption of ASU 2020-06 and follows the if-converted method. Refer to “Recent Accounting Pronouncements” included in Note 1 —“Overview and Summary of Significant Accounting Policies” for further discussion on the adoption of ASU 2020-06.