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Changes in Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Class Of Stock [Line Items]            
Beginning Balance, Amount $ 1,082,465 $ 871,467 $ 992,224 $ 873,799 $ 992,224 $ 873,799
Issuance of common stock under stock plans 1,316 799 23,979 20,693    
Stock-based compensation 112,482 74,527 223,087 130,549    
Settlement of Convertible Note Hedges       60,483    
Cumulative translation adjustment (2,832) (2,793) 1,026 (3,025)    
Unrealized gain on investments, net of income taxes 1,839 (3,701) 3,479 (6,653)    
Net Income (Loss) (5,463) (31,411) (157,228) (65,702) (162,691) (97,113)
Ending Balance, Amount 1,186,339 906,697 1,082,465 871,467 1,186,339 906,697
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]            
Class Of Stock [Line Items]            
Equity component of notes payable, net of issuance costs & repayment       (60,422)    
0.375%Convertible Senior Notes Due 2025 as Liability Component [Member]            
Class Of Stock [Line Items]            
Equity component of notes payable, net of issuance costs & repayment       (691)    
Common Stock [Member]            
Class Of Stock [Line Items]            
Beginning Balance, Amount $ 50 $ 48 $ 49 $ 47 $ 49 $ 47
Beginning Balance, Shares 49,841 47,896 49,217 47,390 49,217 47,390
Issuance of common stock under stock plans     $ 1 $ 1    
Issuance of common stock under stock plans, Shares 280 193 635 506    
Ending Balance, Amount $ 50 $ 48 $ 50 $ 48 $ 50 $ 48
Ending Balance, Shares 50,114 48,255 49,841 47,896 50,114 48,255
Additional Paid-In Capital [Member]            
Class Of Stock [Line Items]            
Beginning Balance, Amount $ 1,890,409 $ 1,477,770 $ 1,647,446 $ 1,436,089 $ 1,647,446 $ 1,436,089
Issuance of common stock under stock plans 1,316 799 23,978 20,692    
Stock-based compensation 112,482 74,527 223,087 130,549    
Settlement of Convertible Note Hedges       60,483    
Ending Balance, Amount 2,000,739 1,550,905 1,890,409 1,477,770 2,000,739 1,550,905
Additional Paid-In Capital [Member] | 0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]            
Class Of Stock [Line Items]            
Equity component of notes payable, net of issuance costs & repayment       (60,422)    
Additional Paid-In Capital [Member] | 0.375%Convertible Senior Notes Due 2025 as Liability Component [Member]            
Class Of Stock [Line Items]            
Equity component of notes payable, net of issuance costs & repayment       (691)    
Accumulated Other Comprehensive Income (Loss) [Member]            
Class Of Stock [Line Items]            
Beginning Balance, Amount (8,385) (11,017) (12,890) (1,339) (12,890) (1,339)
Cumulative translation adjustment (2,832) (2,793) 1,026 (3,025)    
Unrealized gain on investments, net of income taxes 1,839 (3,701) 3,479 (6,653)    
Ending Balance, Amount (9,378) (17,511) (8,385) (11,017) (9,378) (17,511)
Accumulated Deficit [Member]            
Class Of Stock [Line Items]            
Beginning Balance, Amount (799,609) (595,334) (642,381) (560,998) (642,381) (560,998)
Net Income (Loss) (5,463) (31,411) (157,228) (65,702)    
Ending Balance, Amount $ (805,072) $ (626,745) $ (799,609) $ (595,334) $ (805,072) $ (626,745)