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NET INCOME (LOSS) PER COMMON SHARE - Anti-Dilutive Common Stock Excluded From Computation of Basic and Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 20,785 7,836 19,965
Stock Option      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 6,450 5,287 7,264
Common stock issuable under the 2027 Notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 4,365 0 0
Common stock issuable under the 2024 Notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 3,970 0 3,970
Common stock issuable under the 2020 Notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 0 0 3,983
Unvested RSUs      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 5,225 2,235 3,956
Common stock potentially issuable for ESPP purchases      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 594 314 587
The Company's common stock held by the NQDC      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive (in shares) 181 0 205