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Stockholders' Equity - Summary of Restricted Stock Unit Activity and Weighted Average Exercise Price (Details) - RSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Number of Shares    
Beginning balance outstanding (in shares) 5,064  
Awarded (in shares) 8,305  
Vested (in shares) (2,218)  
Forfeited (in shares) (1,057)  
Non-vested and outstanding at end of period (in shares) 10,094  
Expected to vest (in shares) 7,257  
Weighted Average Grant Date Fair Value (usd per share)    
Beginning balance outstanding (in dollars per share) $ 12.53  
Awarded (in dollars per share) 1.02  
Vested (in dollars per share) 10.28  
Forfeited (in dollars per share) 15.86  
Non-vested and outstanding at end of period (in dollars per share) 3.20  
Expected to vest (in dollars per share) $ 3.37  
Aggregate Fair Value    
Aggregate fair value, Non-vested and outstanding $ 12,921 $ 19,193
Aggregate fair value, Expected to vest $ 9,289