Investments and Fair Value Measurements - Unrealized Losses Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Less Than 12 Months, Fair Value	$ 12,561	$ 2,362
12 Months or Greater, Fair Value	0	10,001
Fair Value	12,561	12,363
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	(1)	(5)
12 Months or Greater, Gross Unrealized Loss	0	(4)
Gross Unrealized Loss	(1)	(9)
Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	24,446	17,221
12 Months or Greater, Fair Value	0	0
Fair Value	24,446	17,221
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	(17)	(5)
12 Months or Greater, Gross Unrealized Loss	0	0
Gross Unrealized Loss	(17)	(5)
Commercial paper
Fair Value
Less Than 12 Months, Fair Value	1,198
12 Months or Greater, Fair Value	0
Fair Value	1,198
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	(1)
12 Months or Greater, Gross Unrealized Loss	0
Gross Unrealized Loss	(1)
Commercial paper \| Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	2,646	5,432
12 Months or Greater, Fair Value	0	0
Fair Value	2,646	5,432
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	(4)	(3)
12 Months or Greater, Gross Unrealized Loss	0	0
Gross Unrealized Loss	(4)	(3)
Corporate notes/bonds
Fair Value
Less Than 12 Months, Fair Value	6,374	2,362
12 Months or Greater, Fair Value	0	10,001
Fair Value	6,374	12,363
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	0	(5)
12 Months or Greater, Gross Unrealized Loss	0	(4)
Gross Unrealized Loss	0	(9)
U.S. treasuries
Fair Value
Less Than 12 Months, Fair Value	4,989
12 Months or Greater, Fair Value	0
Fair Value	4,989
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	0
12 Months or Greater, Gross Unrealized Loss	0
Gross Unrealized Loss	0
U.S. treasuries \| Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	21,800	11,789
12 Months or Greater, Fair Value	0	0
Fair Value	21,800	11,789
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Loss	(13)	(2)
12 Months or Greater, Gross Unrealized Loss	0	0
Gross Unrealized Loss	$ (13)	$ (2)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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