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Condensed Statements of Stockholders' Equity (Parenthetical) (Unaudited) $ in Thousands	3 Months Ended
	Jun. 30, 2022 USD ($)
ATM
Common stock, issuance costs	$ 690

X

- Definition

Common stock issuance costs.

+ References

No definition available.

+ Details

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

X

- Details

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