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Changes in Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Class Of Stock [Line Items]    
Beginning Balance, Amount $ 992,224 $ 873,799
Issuance of common stock under stock plans 1,196 2,145
Stock-based compensation 87,305 46,436
Equity component of notes payable, net of issuance costs & repayment   (691)
Cumulative translation adjustment 627 (356)
Unrealized gain on investments, net of income taxes 4,507 (4,001)
Net loss (38,282) (9,341)
Ending Balance, Amount 1,046,379 833,836
Common Stock [Member]    
Class Of Stock [Line Items]    
Beginning Balance, Amount $ 49 $ 47
Beginning Balance, Shares 49,217 47,390
Issuance of common stock under stock plans   $ 1
Issuance of common stock under stock plans, Shares 260 250
Ending Balance, Amount $ 49 $ 48
Ending Balance, Shares 49,473 47,640
Treasury Stock [Member]    
Class Of Stock [Line Items]    
Beginning Balance, Shares 910 910
Ending Balance, Shares 910 910
Additional Paid-In Capital [Member]    
Class Of Stock [Line Items]    
Beginning Balance, Amount $ 1,647,446 $ 1,436,089
Issuance of common stock under stock plans 1,196 2,144
Stock-based compensation 87,305 46,436
Equity component of notes payable, net of issuance costs & repayment   (691)
Ending Balance, Amount 1,734,749 1,378,457
Accumulated Other Comprehensive Income (Loss) [Member]    
Class Of Stock [Line Items]    
Beginning Balance, Amount (12,890) (1,339)
Cumulative translation adjustment 627 (356)
Unrealized gain on investments, net of income taxes 4,507 (4,001)
Ending Balance, Amount (7,756) (5,696)
Accumulated Deficit [Member]    
Class Of Stock [Line Items]    
Beginning Balance, Amount (642,381) (560,998)
Net loss (38,282) (9,341)
Ending Balance, Amount $ (680,663) $ (538,973)