Represents the final payment fee, as a percent of the aggregate advances on the debt.

No definition available.

Name:	srrk_DebtInstrumentFinalPaymentFee
Namespace Prefix:	srrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Dollar value of company's consolidated cash as a percent, as required by the agreement.

+ References

No definition available.

+ Details

Name:	srrk_PercentageOfDollarValueOfConsolidatedCash
Namespace Prefix:	srrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of cash required in a lender's account as a percentage of outstanding obligation requirement as per the agreement.

+ References

No definition available.

+ Details

Name:	srrk_PercentageOfOutstandingObligation
Namespace Prefix:	srrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Prepayment penalty as a percent

+ References

No definition available.

+ Details

Name:	srrk_PrepaymentPenaltyPercent
Namespace Prefix:	srrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=srrk_LoanAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Details) - USD ($) $ in Thousands			12 Months Ended
Debt (Details) - USD ($) $ in Thousands	Nov. 16, 2021	Oct. 16, 2020	Dec. 31, 2021	Dec. 31, 2020
Debt
Proceeds from credit facility			$ 24,984	$ 24,622
Loan and Security Agreement
Debt
Line of credit maximum		$ 50,000
Proceeds from credit facility		$ 25,000	25,000
Remaining borrowing capacity			$ 25,000
Variable rate (as a percent)	7.85%
Final payment fee (as a percent)	4.00%
Percentage of dollar value of company's consolidated cash	100.00%
Amount of cash required in a lender's account as a percentage of outstanding obligation (as a percent)	105.00%
Loan and Security Agreement \| Financing receivable, lower range of payment terms
Debt
Prepayment penalty (as a percent)	2.00%
Loan and Security Agreement \| Financing receivable, upper range of payment terms
Debt
Prepayment penalty (as a percent)	3.00%
Loan and Security Agreement \| Wall Street Journal prime rate
Debt
Variable rate (as a percent)	4.60%