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Investments - Fair Values and Gross Unrealized Gains and Losses on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Cash and cash equivalents $ 9,016 $ 6,690
Investments, amortized cost 20,732 58,733
Investments, gross unrealized gains 0 0
Investments, gross unrealized losses (16) (144)
Total investments 20,716 58,589
Investments, net carrying value 20,732 58,733
Commercial paper    
Schedule of Held-to-maturity Securities [Line Items]    
Cash and cash equivalents 2,964  
Cash equivalents, gross unrealized gains 2  
Cash equivalents, gross unrealized losses 0  
Cash equivalents, fair value 2,966  
Commercial paper    
Schedule of Held-to-maturity Securities [Line Items]    
Investments, amortized cost 20,732 58,733
Investments, gross unrealized gains 0 0
Investments, gross unrealized losses (16) (144)
Total investments 20,716 58,589
Investments, net carrying value $ 20,732 $ 58,733