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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Assets fair value $ 5,457 $ 5,389
Cash equivalents | Money Market Funds    
Assets:    
Assets fair value 5,457 5,318
Short-term Investments | Asset-backed securities    
Assets:    
Assets fair value   71
Level 1    
Assets:    
Assets fair value 5,457 5,318
Level 1 | Cash equivalents | Money Market Funds    
Assets:    
Assets fair value 5,457 5,318
Level 2    
Assets:    
Assets fair value $ 0 71
Level 2 | Short-term Investments | Asset-backed securities    
Assets:    
Assets fair value   $ 71