| 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 | |
| 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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