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Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Series B Redeemable Convertible Preferred Stock [Member]
Stock issuance costs	$ 76

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- Definition

Stock issuance costs.

+ References

No definition available.

+ Details

Name:	sbtx_StockIssuanceCosts
Namespace Prefix:	sbtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_StatementClassOfStockAxis=sbtx_SeriesBRedeemableConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: