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v3.21.1

Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands | 3 Months Ended
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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
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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: |