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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Total assets $ 1,456 $ 3,407
Royalties payable 7,060 6,974
Total liabilities 7,060 6,974
Mutual fund 1,451 3,397
Money market fund 5 10
Level 1 [Member]    
Total assets 1,456 3,407
Royalties payable 0 0
Total liabilities 0 0
Mutual fund 1,451 3,397
Money market fund 5 10
Level 2 [Member]    
Total assets 0 0
Royalties payable 0 0
Total liabilities 0 0
Mutual fund 0 0
Money market fund 0 0
Level 3 [Member]    
Total assets 0 0
Royalties payable 7,060 6,974
Total liabilities 7,060 6,974
Mutual fund 0 0
Money market fund $ 0 $ 0