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Condensed Statements of Stockholders' Equity (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022
ATM
Common stock, issuance costs	$ 151	$ 308	$ 902	$ 690

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- Definition

Common stock issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	stro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=stro_AttheMarketIssuanceSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: