Related Party Transactions (Board Services Agreement) (Details) - Caribe BioAdvisors - USD ($)  | 
1 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
Jan. 31, 2017  | 
Dec. 31, 2016  | 
Mar. 31, 2025  | 
Mar. 31, 2024  | 
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| Mustang | Board services agreement | ||||
| Related Party Transactions | ||||
| Advisory fees | $ 60,000 | $ 15,000 | $ 15,000 | |
| Checkpoint | Board services agreement | ||||
| Related Party Transactions | ||||
| Advisory fees | $ 60,000 | 32,000 | 27,000 | |
| Checkpoint | Common Stock | ||||
| Related Party Transactions | ||||
| Advisory fees | $ 17,000 | $ 12,000 | ||
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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