Stockholders' Equity (Deficit) - Stock Reserved for Future Issuance (Details) - shares	Sep. 30, 2024	Feb. 29, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	70,073,132		139,700,734
2017 Plan
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	0		7,919,000
2024 Plan
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	36,444,908	31,747,592	0
Community Impact Initiatives And Charitable Activities
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	1,337,205		1,337,205
Conversion of outstanding convertible preferred stock
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	0		73,021,449
Outstanding stock options
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	18,658,940		29,795,909
Outstanding RSUs
Class of Stock [Line Items]
Total shares of common stock reserved (in shares)	13,632,079		27,627,171