Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Long-Term Investments [Abstract]
Amortized cost		$ 78,184,000
Unrealized gains		0
Unrealized losses		(45,000)
Estimated fair value		78,139,000
Unrealized gain (loss)	$ 0
U.S. Treasury securities
Short-Term Investments [Abstract]
Amortized cost		68,005,000
Unrealized gains		0
Unrealized losses		(37,000)
Estimated fair value		67,968,000
Long-Term Investments [Abstract]
Amortized cost		10,179,000
Unrealized gains		0
Unrealized losses		(8,000)
Estimated fair value		$ 10,171,000