v3.26.1
Investments and Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments $ 0  
Fair Value, Recurring | Cash Equivalents | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents 1,864,000 $ 1,887,000
Fair Value, Recurring | Restricted Cash and Investments | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents   1,519,000
Fair Value, Recurring | U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 6,189,000 16,279,000
Fair Value, Recurring | U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments   8,747,000
Fair Value, Recurring | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value   9,979,000
Fair Value, Recurring | Level 1 | Cash Equivalents | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents 1,864,000 1,887,000
Fair Value, Recurring | Level 1 | Restricted Cash and Investments | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents   1,519,000
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 Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments   0
Fair Value, Recurring | Level 1 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value   0
Fair Value, Recurring | Level 2 | Cash Equivalents | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents 0 0
Fair Value, Recurring | Level 2 | Restricted Cash and Investments | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents   0
Fair Value, Recurring | Level 2 | U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 6,189,000 16,279,000
Fair Value, Recurring | Level 2 | U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments   8,747,000
Fair Value, Recurring | Level 2 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value   0
Fair Value, Recurring | Level 3 | Cash Equivalents | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents 0 0
Fair Value, Recurring | Level 3 | Restricted Cash and Investments | Money market funds classified as cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds classified as cash equivalents   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 Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments   0
Fair Value, Recurring | Level 3 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value   $ 9,979,000