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Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents | $ 413 | $ 6,954
Related party note receivable | 5,725 |
Investment in MiNK Therapeutics, Inc. | 30,482 |
Long-term investments | 849 | 1,006
Total | 37,469 | 7,960
Purchaser Upsize Option |  | 69
Contingent purchase price consideration |  | 318
Total |  | 387
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents | 413 | 6,954
Related party note receivable | 0 |
Investment in MiNK Therapeutics, Inc. | 30,482 |
Long-term investments | 849 | 1,006
Total | 31,744 | 7,960
Contingent purchase price consideration |  | 0
Total |  | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 | 0
Related party note receivable | 5,725 |
Investment in MiNK Therapeutics, Inc. | 0 |
Long-term investments | 0 | 0
Total | 5,725 | 0
Contingent purchase price consideration |  | 0
Total |  | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents | 0 | 0
Related party note receivable | 0 |
Investment in MiNK Therapeutics, Inc. | 0 |
Long-term investments | 0 | 0
Total | $ 0 | 0
Purchaser Upsize Option |  | 69
Contingent purchase price consideration |  | 318
Total |  | $ 387

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