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Commitments and Contingencies - Schedule of Future Minimum Payments under Noncancelable Operating Sublease (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Commitments And Contingencies Disclosure [Abstract] |
2021 | $ 3,820
2022 | 5,228
2023 | 6,828
2024 | 7,540
Thereafter | 24,241
Total future minimum sublease payments | $ 47,657

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- Definition Lessee operating sublease liability payments due. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDue
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee operating sublease liability payments due after year four. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDueAfterYearFour
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee operating sublease liability payments due next twelve months. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDueNextTwelveMonths
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee operating sublease liability payments due year four. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDueYearFour
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee operating sublease liability payments due year three. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDueYearThree
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee operating sublease liability payments due year two. + References No definition available. + Details
Name: | stro_LesseeOperatingSubleaseLiabilityPaymentsDueYearTwo
Namespace Prefix: | stro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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