Investments, Investments by Types and Classes of Security (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions	$ 55	$ 1,437
Fair value of investments due to credit-related factors	0	0
Corporate Debt Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions		132
Commercial Paper [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions	1
US Treasury Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions		1,254
US Agency Bonds [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions	46	9
Asset-backed Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Securities in material unrealized loss positions	8	42
Short-term Investment [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	97,073	173,534
Unrealized Gains	11	6
Unrealized Losses	(48)	(1,326)
Estimated Fair Value	97,036	172,214
Short-term Investment [Member] | Corporate Debt Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	5,970	9,604
Unrealized Gains	1	2
Unrealized Losses	0	(72)
Estimated Fair Value	$ 5,971	$ 9,534
Short-term Investment [Member] | Corporate Debt Securities [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	1 year	1 year
Short-term Investment [Member] | Commercial Paper [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	$ 37,019	$ 41,243
Unrealized Gains	10	0
Unrealized Losses	(1)	0
Estimated Fair Value	$ 37,028	$ 41,243
Short-term Investment [Member] | Commercial Paper [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	1 year	1 year
Short-term Investment [Member] | US Treasury Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost		$ 119,810
Unrealized Gains		0
Unrealized Losses		(1,254)
Estimated Fair Value		$ 118,556
Short-term Investment [Member] | US Treasury Securities [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years		1 year
Short-term Investment [Member] | US Agency Bonds [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	$ 51,485	$ 2,877
Unrealized Gains	0	4
Unrealized Losses	(46)	0
Estimated Fair Value	$ 51,439	$ 2,881
Short-term Investment [Member] | US Agency Bonds [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	1 year	1 year
Short-term Investment [Member] | Asset-backed Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	$ 2,599
Unrealized Gains	0
Unrealized Losses	(1)
Estimated Fair Value	2,598
Long-term Investments [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	10,229	$ 39,230
Unrealized Gains	37	20
Unrealized Losses	(7)	(111)
Estimated Fair Value	10,259	39,139
Long-term Investments [Member] | Corporate Debt Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	1,524	15,426
Unrealized Gains	25	0
Unrealized Losses	0	(60)
Estimated Fair Value	$ 1,549	$ 15,366
Long-term Investments [Member] | Corporate Debt Securities [Member] | Minimum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	1 year	1 year
Long-term Investments [Member] | Corporate Debt Securities [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	2 years	2 years
Long-term Investments [Member] | US Agency Bonds [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost		$ 5,907
Unrealized Gains		0
Unrealized Losses		(9)
Estimated Fair Value		$ 5,898
Long-term Investments [Member] | US Agency Bonds [Member] | Minimum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years		1 year
Long-term Investments [Member] | US Agency Bonds [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years		2 years
Long-term Investments [Member] | Asset-backed Securities [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Amortized Cost	$ 8,705	$ 17,897
Unrealized Gains	12	20
Unrealized Losses	(7)	(42)
Estimated Fair Value	$ 8,710	$ 17,875
Long-term Investments [Member] | Asset-backed Securities [Member] | Minimum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	1 year	1 year
Long-term Investments [Member] | Asset-backed Securities [Member] | Maximum [Member]
Available-for-sale Investments by Types and Classes of Security [Abstract]
Maturity in Years	2 years	2 years