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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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