v3.26.1
FAIR VALUE MEASUREMENTS - Fair Value of Assets Measured on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial assets    
Cash equivalents $ 0 $ 23,637
Total financial assets 1,742,007 1,416,233
U.S. treasury securities    
Financial assets    
Marketable debt securities 808,038 653,341
Corporate notes    
Financial assets    
Marketable debt securities 437,947 333,241
U.S. government-sponsored enterprise securities    
Financial assets    
Marketable debt securities 339,623 252,634
Commercial paper    
Financial assets    
Marketable debt securities 14,221 7,017
Municipal securities    
Financial assets    
Marketable debt securities   5,001
Quoted Prices in Active Markets (Level 1)    
Financial assets    
Total financial assets 142,178 141,362
Quoted Prices in Active Markets (Level 1) | U.S. treasury securities    
Financial assets    
Marketable debt securities 0 0
Quoted Prices in Active Markets (Level 1) | Corporate notes    
Financial assets    
Marketable debt securities 0 0
Quoted Prices in Active Markets (Level 1) | U.S. government-sponsored enterprise securities    
Financial assets    
Marketable debt securities 0 0
Quoted Prices in Active Markets (Level 1) | Commercial paper    
Financial assets    
Marketable debt securities 0 0
Quoted Prices in Active Markets (Level 1) | Municipal securities    
Financial assets    
Marketable debt securities   0
Significant Observable Inputs (Level 2)    
Financial assets    
Total financial assets 1,599,829 1,274,871
Significant Observable Inputs (Level 2) | U.S. treasury securities    
Financial assets    
Marketable debt securities 808,038 653,341
Significant Observable Inputs (Level 2) | Corporate notes    
Financial assets    
Marketable debt securities 437,947 333,241
Significant Observable Inputs (Level 2) | U.S. government-sponsored enterprise securities    
Financial assets    
Marketable debt securities 339,623 252,634
Significant Observable Inputs (Level 2) | Commercial paper    
Financial assets    
Marketable debt securities 14,221 7,017
Significant Observable Inputs (Level 2) | Municipal securities    
Financial assets    
Marketable debt securities   5,001
Significant Unobservable Inputs (Level 3)    
Financial assets    
Total financial assets 0 0
Significant Unobservable Inputs (Level 3) | U.S. treasury securities    
Financial assets    
Marketable debt securities 0 0
Significant Unobservable Inputs (Level 3) | Corporate notes    
Financial assets    
Marketable debt securities 0 0
Significant Unobservable Inputs (Level 3) | U.S. government-sponsored enterprise securities    
Financial assets    
Marketable debt securities 0 0
Significant Unobservable Inputs (Level 3) | Commercial paper    
Financial assets    
Marketable debt securities 0 0
Significant Unobservable Inputs (Level 3) | Municipal securities    
Financial assets    
Marketable debt securities   0
Money market funds    
Financial assets    
Cash equivalents 141,609 140,445
Restricted cash (money market funds) 569 917
Money market funds | Quoted Prices in Active Markets (Level 1)    
Financial assets    
Cash equivalents 141,609 140,445
Restricted cash (money market funds) 569 917
Money market funds | Significant Observable Inputs (Level 2)    
Financial assets    
Cash equivalents 0 0
Restricted cash (money market funds) 0 0
Money market funds | Significant Unobservable Inputs (Level 3)    
Financial assets    
Cash equivalents 0 0
Restricted cash (money market funds) $ 0 0
U.S. treasury securities    
Financial assets    
Cash equivalents   18,952
U.S. treasury securities | Quoted Prices in Active Markets (Level 1)    
Financial assets    
Cash equivalents   0
U.S. treasury securities | Significant Observable Inputs (Level 2)    
Financial assets    
Cash equivalents   18,952
U.S. treasury securities | Significant Unobservable Inputs (Level 3)    
Financial assets    
Cash equivalents   0
U.S. government-sponsored enterprise securities    
Financial assets    
Cash equivalents   2,690
U.S. government-sponsored enterprise securities | Quoted Prices in Active Markets (Level 1)    
Financial assets    
Cash equivalents   0
U.S. government-sponsored enterprise securities | Significant Observable Inputs (Level 2)    
Financial assets    
Cash equivalents   2,690
U.S. government-sponsored enterprise securities | Significant Unobservable Inputs (Level 3)    
Financial assets    
Cash equivalents   0
Commercial paper    
Financial assets    
Cash equivalents   1,995
Commercial paper | Quoted Prices in Active Markets (Level 1)    
Financial assets    
Cash equivalents   0
Commercial paper | Significant Observable Inputs (Level 2)    
Financial assets    
Cash equivalents   1,995
Commercial paper | Significant Unobservable Inputs (Level 3)    
Financial assets    
Cash equivalents   $ 0