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Composition of Certain Consolidated Financial Statement Line Items - Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Composition of Certain Consolidated Financial Statement Line Items |  |
Accrued compensation | $ 8,551 | $ 7,290
Accrued research and development expenses | 5,192 | 5,460
Accrued clinical expenses | 13,493 | 7,025
Accrued professional services | 3,122 | 2,918
Accrued other liabilities | 6,571 | 3,606
Total accrued expenses and other current liabilities | $ 36,929 | $ 26,299

X
- Definition Carrying amount as of the balance sheet date of current portion of accrued clinical expenses. + References No definition available. + Details
Name: | gpcr_AccruedClinicalExpensesCurrent
Namespace Prefix: | gpcr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of current portion of accrued expenses and other liabilities as at the end of the reporting period. + References No definition available. + Details
Name: | gpcr_AccruedExpensesAndOtherLiabilitiesCurrent
Namespace Prefix: | gpcr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of current portion of accrued research and development expenses. + References No definition available. + Details
Name: | gpcr_AccruedResearchAndDevelopmentExpensesCurrent
Namespace Prefix: | gpcr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AccruedProfessionalFeesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_EmployeeRelatedLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant