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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders Equity (Deficit) (Unaudited) (Parenthetical) $ in Millions	3 Months Ended
	Jun. 30, 2026 USD ($)
Statement of Stockholders' Equity [Abstract]
Initial public offering, net of issuance costs	$ 21.7

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- Definition

Initial public offering, net of issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptx_
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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration