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Fair Value Measurements (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Assets:    
Assets, fair value $ 89,971 $ 115,436
Liabilities:    
Liabilities, fair value 1,127 698
Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 1,127 698
Money market funds    
Assets:    
Assets, fair value 60,976 71,175
Commercial paper    
Assets:    
Assets, fair value 20,538 31,935
U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 1,479  
Corporate bonds    
Assets:    
Assets, fair value 996 7,022
U.S. treasury notes    
Assets:    
Assets, fair value 5,982  
Asset backed securities    
Assets:    
Assets, fair value   5,304
Level 1    
Assets:    
Assets, fair value 60,976 71,175
Liabilities:    
Liabilities, fair value 0 0
Level 1 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 0 0
Level 1 | Money market funds    
Assets:    
Assets, fair value 60,976 71,175
Level 1 | Commercial paper    
Assets:    
Assets, fair value 0 0
Level 1 | U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 0  
Level 1 | Corporate bonds    
Assets:    
Assets, fair value 0 0
Level 1 | U.S. treasury notes    
Assets:    
Assets, fair value 0  
Level 1 | Asset backed securities    
Assets:    
Assets, fair value   0
Level 2    
Assets:    
Assets, fair value 28,995 44,261
Liabilities:    
Liabilities, fair value 0 0
Level 2 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 0 0
Level 2 | Money market funds    
Assets:    
Assets, fair value 0 0
Level 2 | Commercial paper    
Assets:    
Assets, fair value 20,538 31,935
Level 2 | U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 1,479  
Level 2 | Corporate bonds    
Assets:    
Assets, fair value 996 7,022
Level 2 | U.S. treasury notes    
Assets:    
Assets, fair value 5,982  
Level 2 | Asset backed securities    
Assets:    
Assets, fair value   5,304
Level 3    
Assets:    
Assets, fair value 0 0
Liabilities:    
Liabilities, fair value 1,127 698
Level 3 | Derivative liabilities for exit fees    
Liabilities:    
Liabilities, fair value 1,127 698
Level 3 | Money market funds    
Assets:    
Assets, fair value 0 0
Level 3 | Commercial paper    
Assets:    
Assets, fair value 0 0
Level 3 | U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 0  
Level 3 | Corporate bonds    
Assets:    
Assets, fair value 0 0
Level 3 | U.S. treasury notes    
Assets:    
Assets, fair value $ 0  
Level 3 | Asset backed securities    
Assets:    
Assets, fair value   $ 0