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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Assets, fair value $ 163,547 $ 112,082
Liabilities:    
Liabilities, fair value 2,055 1,656
Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 2,055 1,656
Level 1    
Assets:    
Assets, fair value 32,234 84,313
Liabilities:    
Liabilities, fair value 0 0
Level 1 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 0 0
Level 2    
Assets:    
Assets, fair value 131,313 27,769
Liabilities:    
Liabilities, fair value 0 0
Level 2 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 0 0
Level 3    
Assets:    
Assets, fair value 0 0
Liabilities:    
Liabilities, fair value 2,055 1,656
Level 3 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 2,055 1,656
Money market funds    
Assets:    
Assets, fair value 32,234 84,313
Money market funds | Level 1    
Assets:    
Assets, fair value 32,234 84,313
Money market funds | Level 2    
Assets:    
Assets, fair value 0 0
Money market funds | Level 3    
Assets:    
Assets, fair value 0 0
Commercial paper    
Assets:    
Assets, fair value 82,719 25,291
Commercial paper | Level 1    
Assets:    
Assets, fair value 0 0
Commercial paper | Level 2    
Assets:    
Assets, fair value 82,719 25,291
Commercial paper | Level 3    
Assets:    
Assets, fair value 0 0
U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 31,811 1,479
U.S. government-sponsored agency bonds | Level 1    
Assets:    
Assets, fair value 0 0
U.S. government-sponsored agency bonds | Level 2    
Assets:    
Assets, fair value 31,811 1,479
U.S. government-sponsored agency bonds | Level 3    
Assets:    
Assets, fair value 0 0
Corporate bonds    
Assets:    
Assets, fair value 6,282 999
Corporate bonds | Level 1    
Assets:    
Assets, fair value 0 0
Corporate bonds | Level 2    
Assets:    
Assets, fair value 6,282 999
Corporate bonds | Level 3    
Assets:    
Assets, fair value 0 0
Asset-backed securities    
Assets:    
Assets, fair value 10,501 0
Asset-backed securities | Level 1    
Assets:    
Assets, fair value 0 0
Asset-backed securities | Level 2    
Assets:    
Assets, fair value 10,501 0
Asset-backed securities | Level 3    
Assets:    
Assets, fair value $ 0 $ 0