Investments and Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Oct. 11, 2023	Dec. 31, 2022
Purchase option liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 8,500	$ 9,800
Level 3 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	0		$ 0
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	48,823		108,095
Fair Value, Recurring | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	9,752		1,868
Fair Value, Recurring | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	35,117
Fair Value, Recurring | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments			20,020
Fair Value, Recurring | Commercial paper | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	5,432
Fair Value, Recurring | Corporate notes/bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	14,360		86,094
Fair Value, Recurring | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	34,463		1,981
Fair Value, Recurring | U.S. treasuries | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	29,685
Fair Value, Recurring | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	10,890		22,352
Fair Value, Recurring | Convertible notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	69,803
Fair Value, Recurring | Purchase option liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	8,534
Fair Value, Recurring | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 1 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	9,752		1,868
Fair Value, Recurring | Level 1 | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 1 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments			0
Fair Value, Recurring | Level 1 | Commercial paper | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 1 | Corporate notes/bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 1 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 1 | U.S. treasuries | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 1 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0		0
Fair Value, Recurring | Level 1 | Convertible notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0
Fair Value, Recurring | Level 1 | Purchase option liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0
Fair Value, Recurring | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	48,823		108,095
Fair Value, Recurring | Level 2 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	0		0
Fair Value, Recurring | Level 2 | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	35,117
Fair Value, Recurring | Level 2 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments			20,020
Fair Value, Recurring | Level 2 | Commercial paper | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	5,432
Fair Value, Recurring | Level 2 | Corporate notes/bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	14,360		86,094
Fair Value, Recurring | Level 2 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	34,463		1,981
Fair Value, Recurring | Level 2 | U.S. treasuries | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	29,685
Fair Value, Recurring | Level 2 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0		0
Fair Value, Recurring | Level 2 | Convertible notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0
Fair Value, Recurring | Level 2 | Purchase option liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	0
Fair Value, Recurring | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 3 | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 3 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments			0
Fair Value, Recurring | Level 3 | Commercial paper | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 3 | Corporate notes/bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 3 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0		0
Fair Value, Recurring | Level 3 | U.S. treasuries | Restricted Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0
Fair Value, Recurring | Level 3 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	10,890		$ 22,352
Fair Value, Recurring | Level 3 | Convertible notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	69,803
Fair Value, Recurring | Level 3 | Purchase option liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 8,534