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Equity Incentive Plan - Summary of Stock Option Activity (Details) - $ / shares
shares in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Equity [Abstract]    
Number of shares outstanding 20,749,349  
Number of shares granted 16,116,979  
Number of shares exercised (369)  
Number of shares expired and forfeited (5,548,978)  
Number of shares outstanding 31,316,981 20,749,349
Weighted-Average Exercise Price, outstanding $ 14.61  
Weighted-Average Exercise Price, granted 1.7  
Weighted-Average Exercise Price, exercised 1.32  
Weighted-Average Exercise Price, expired and forfeited 9.47  
Weighted-Average Exercise Price, outstanding $ 8.88 $ 14.61
Weighted-Average Remaining Contractual Term (Years) 6 years 6 months 10 days 6 years 5 months 8 days