v3.26.1
Investments and Fair Value Measurements - Financial Assets and Liabilities (Details) - Fair Value, Recurring - USD ($)
Dec. 31, 2025
Dec. 31, 2024
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 $ 1,887,000 $ 5,844,000
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  
U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 16,279,000 302,000
U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 8,747,000 11,000,000
Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value 9,979,000 20,362,000
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 1,887,000 5,844,000
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  
Level 1 | U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 0 0
Level 1 | U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 0 0
Level 1 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value 0 0
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
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  
Level 2 | U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 16,279,000 302,000
Level 2 | U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 8,747,000 11,000,000
Level 2 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value 0 0
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
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  
Level 3 | U.S. treasuries    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 0 0
Level 3 | U.S. treasuries | Restricted Cash and Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 0 0
Level 3 | Convertible High Trail notes payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value $ 9,979,000 $ 20,362,000