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v3.24.1.u1

Other Receivables (Additional Information) (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jan. 31, 2024 | Mar. 31, 2024
Other Receivables, Net, Current [Abstract] |  |
Refundable fee payble |  | $ 6.1
Payment for fully-refundable fee | $ 6.1 |

X
- Definition Payment for Fully-refundable Fee + References No definition available. + Details
Name: | sndx_PaymentForFullyRefundableFee
Namespace Prefix: | sndx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Refundable Fee Payble + References No definition available. + Details
Name: | sndx_RefundableFeePayble
Namespace Prefix: | sndx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration