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Stock-Based Compensation Expense - Schedule of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Number of Shares Subject to Options (in thousands)    
Beginning balance (in shares) | shares 9,178  
Cancelled, forfeited, and expired (in shares) | shares (17)  
Exercised (in shares) | shares (1,759)  
Ending balance (in shares) | shares 7,402 9,178
Weighted-Average Exercise Price (per Option)    
Beginning balance (in dollars per share) | $ / shares $ 3.64  
Cancelled, forfeited, and expired (in dollars per share) | $ / shares 1.05  
Exercised (in dollars per share) | $ / shares 3.50  
Ending balance (in dollars per share) | $ / shares $ 3.68 $ 3.64
Weighted-Average Remaining Contractual Term (Years) 2 years 8 months 15 days 3 years 25 days
Aggregate Intrinsic Value (in millions) | $ $ 375 $ 710