Fair Value Measurements - Fair value hierarchy (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments Measurements
Transfers between Level 1, Level 2 and Level 3	$ 0	$ 0
Fair Value, Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Total	78,709	207,856
Fair Value, Recurring [Member] | Level 1
Summary of assets measured at fair value on a recurring basis
Total	7,709	7,924
Fair Value, Recurring [Member] | Level 2
Summary of assets measured at fair value on a recurring basis
Total	71,000	199,932
Fair Value, Recurring [Member] | Money market funds
Summary of assets measured at fair value on a recurring basis
Cash and cash equivalents	7,709	1,944
Fair Value, Recurring [Member] | Money market funds | Level 1
Summary of assets measured at fair value on a recurring basis
Cash and cash equivalents	7,709	1,944
Fair Value, Recurring [Member] | Corporate debt securities
Summary of assets measured at fair value on a recurring basis
Short-term investments:		16,445
Fair Value, Recurring [Member] | Corporate debt securities | Level 2
Summary of assets measured at fair value on a recurring basis
Short-term investments:		16,445
Fair Value, Recurring [Member] | Yankee securities
Summary of assets measured at fair value on a recurring basis
Short-term investments:		1,999
Fair Value, Recurring [Member] | Yankee securities | Level 2
Summary of assets measured at fair value on a recurring basis
Short-term investments:		1,999
Fair Value, Recurring [Member] | Bonds
Summary of assets measured at fair value on a recurring basis
Short-term investments:		2,988
Fair Value, Recurring [Member] | Bonds | Level 2
Summary of assets measured at fair value on a recurring basis
Short-term investments:		2,988
Fair Value, Recurring [Member] | Treasury bills
Summary of assets measured at fair value on a recurring basis
Short-term investments:		5,980
Fair Value, Recurring [Member] | Treasury bills | Level 1
Summary of assets measured at fair value on a recurring basis
Short-term investments:		5,980
Fair Value, Recurring [Member] | Reverse repurchase agreements
Summary of assets measured at fair value on a recurring basis
Short-term investments:	71,000	178,500
Fair Value, Recurring [Member] | Reverse repurchase agreements | Level 2
Summary of assets measured at fair value on a recurring basis
Short-term investments:	$ 71,000	$ 178,500