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Royalty Interest Financing Liability (Tables) | 6 Months Ended
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Jun. 30, 2026
Purchase and Sale Agreement [Abstract] |
Schedule of Term Loan Payables | The Company made $15.3 million of paym ents pursuant to the Purchase and Sale Agreement during the six month period ended June 30, 2026.
|  | June 30, 2026 |  |  | December 31, 2025 |
Current portion of royalty interest financing liability |  | $ | — |  |  | $ | — |
Royalty interest financing liability, less current portion |  |  | 350,000 |  |  |  | 350,000 |
Debt issuance costs |  |  | (5,974 | ) |  |  | (6,091 | )
Total royalty interest financing liability, net |  | $ | 344,026 |  |  | $ | 343,909 |

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- Definition Purchase and Sale Agreement [Abstract] + References No definition available. + Details
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Namespace Prefix: | sndx_
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
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