XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

Related-Party Transactions (Details) | Dec. 31, 2020
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Takeda |
Related Party Transaction [Line Items] |
Shareholder ownership percentage | 0.050

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- Definition Shareholder Ownership Percentage + References No definition available. + Details
Name: | sttk_ShareholderOwnershipPercentage
Namespace Prefix: | sttk_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=sttk_TakedaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |