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Stock-Based Compensation - Summary of Stock Options Activity Under 2018 Plan and 2015 Equity Incentive Plan (Details) - 2018 Plan, 2015 Equity Incentive Plan and 2021 LTPIP - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Number of Options    
Beginning balance 17,601,466  
Granted 4,173,150  
Exercised (8,333)  
Forfeited or canceled (1,105,760)  
Ending balance 20,660,523 17,601,466
Weighted Average Exercise Price    
Beginning balance $ 43.86  
Granted 2.56  
Exercised 4.54  
Forfeited or canceled 31.29  
Ending balance $ 36.21 $ 43.86
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 7 years 1 month 6 days 7 years 3 months 14 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value Beginning balance $ 933  
Aggregate Intrinsic Value ending balance $ 1,190 $ 933