Debt instrument extended maturity date.

No definition available.

Name:	icu_DebtInstrumentExtendedMaturityDate
Namespace Prefix:	icu_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument, repaid date.

+ References

No definition available.

+ Details

Name:	icu_DebtInstrumentRepaidDate
Namespace Prefix:	icu_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Discount of senior unsecured convertible note issued.

+ References

No definition available.

+ Details

Name:	icu_DiscountOfSeniorUnsecuredConvertibleNoteIssued
Namespace Prefix:	icu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate of senior unsecured convertible note issued.

+ References

No definition available.

+ Details

Name:	icu_InterestRateOfSeniorUnsecuredConvertibleNoteIssued
Namespace Prefix:	icu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Payment of notes payable.

+ References

No definition available.

+ Details

Name:	icu_PaymentOfNotesPayable
Namespace Prefix:	icu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Proceeds from upfront payment.

+ References

No definition available.

+ Details

Name:	icu_ProceedsFromUpfrontPayment
Namespace Prefix:	icu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Promissory note prepayment penalty.

+ References

No definition available.

+ Details

Name:	icu_PromissoryNotePrepaymentPenalty
Namespace Prefix:	icu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Stock issued during period, shares, warrants purchase.

+ References

No definition available.

+ Details

Name:	icu_StockIssuedDuringPeriodSharesWarrantsPurchase
Namespace Prefix:	icu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant expiration period.

+ References

No definition available.

+ Details

Name:	icu_WarrantExpirationPeriod
Namespace Prefix:	icu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
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+ Details

Name:	us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=icu_LicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Details) - USD ($)				3 Months Ended	12 Months Ended
	Mar. 15, 2023	Mar. 13, 2023	Jan. 03, 2023	Mar. 30, 2023	Dec. 31, 2022	Nov. 02, 2022	Sep. 09, 2022
Subsequent Event [Line Items]
Debt instrument, face amount					$ 63,000
Debt instrument, interest rate, stated percentage					3.75%
Payment on notes payable outstanding					$ (15,000)
LMFA Note Payable [Member]
Subsequent Event [Line Items]
Debt instrument, face amount						$ 268,000	$ 700,000
Debt instrument, interest rate, stated percentage							15.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt instrument, face amount	$ 3,261,000
Warrant to purchase shares of common stock	328,352
Payment on notes payable outstanding				$ (2,701,000)
Subsequent Event [Member] \| Common Stock [Member]
Subsequent Event [Line Items]
Conversion of stock, shares converted	1,207,729
Debt instrument convertible conversion price	$ 2.70
Subsequent Event [Member] \| Senior Unsecured Convertible Notes [Member]
Subsequent Event [Line Items]
Debt instrument, face amount	$ 9,800,000
Discount of senior unsecured convertible note issued	8.00%
Interest rate of senior unsecured convertible note issued	7.00%
Debt instrument, maturity date	Jun. 15, 2024
Warrants initial exercise price	$ 2.97
Warrant expiration period	5 years
Subsequent Event [Member] \| LMFA Note Payable [Member]
Subsequent Event [Line Items]
Debt instrument, face amount		$ 100,000
Debt instrument, interest rate, stated percentage		7.00%
Promissory note prepayment penalty		$ 0
Loan repaid date		Mar. 24, 2023
Subsequent Event [Member] \| Lmfa Notes, Lmfao Note and Maxim Note [Member]
Subsequent Event [Line Items]
Debt instrument, face amount	$ 100
Debt instrument extended maturity date	Jun. 15, 2024
Subsequent Event [Member] \| License Agreement [Member]
Subsequent Event [Line Items]
Proceeds from upfront payment			$ 100,000