Investments and Fair Value Measurements - Amortized Cost and Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Less than 1 year	$ 12,562	$ 48,828
Unrealized Gains
Less than 1 year	0	4
Unrealized Losses
Less than 1 year	(1)	(9)
Aggregate Estimated Fair Value
Less than 1 year	12,561	48,823
Restricted Investments
Amortized Cost
Less than 1 year	24,463	35,117
Unrealized Gains
Less than 1 year	0	5
Unrealized Losses
Less than 1 year	(17)	(5)
Aggregate Estimated Fair Value
Less than 1 year	24,446	35,117
Commercial paper
Amortized Cost
Less than 1 year	1,199	14,369
Unrealized Gains
Less than 1 year	0	0
Unrealized Losses
Less than 1 year	(1)	(9)
Aggregate Estimated Fair Value
Less than 1 year	1,198	14,360
Commercial paper \| Restricted Investments
Amortized Cost
Less than 1 year	2,650	5,435
Unrealized Gains
Less than 1 year	0	0
Unrealized Losses
Less than 1 year	(4)	(3)
Aggregate Estimated Fair Value
Less than 1 year	2,646	5,432
Corporate notes/bonds
Amortized Cost
Less than 1 year	6,374
Unrealized Gains
Less than 1 year	0
Unrealized Losses
Less than 1 year	0
Aggregate Estimated Fair Value
Less than 1 year	6,374
U.S. treasuries
Amortized Cost
Less than 1 year	4,989	34,459
Unrealized Gains
Less than 1 year	0	4
Unrealized Losses
Less than 1 year	0	0
Aggregate Estimated Fair Value
Less than 1 year	4,989	34,463
U.S. treasuries \| Restricted Investments
Amortized Cost
Less than 1 year	21,813	29,682
Unrealized Gains
Less than 1 year	0	5
Unrealized Losses
Less than 1 year	(13)	(2)
Aggregate Estimated Fair Value
Less than 1 year	$ 21,800	$ 29,685

Debt Securities, Available-for-Sale, Unrealized Gain, Maturity, Allocated and Single Maturity Date, Year One

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Debt Securities, Available for Sale, Unrealized Gains

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Debt Securities, Available-for-Sale, Unrealized Loss, Maturity, Allocated and Single Maturity Date, Year One

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480832/942-320-50-3A

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