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Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Unfunded loan commitments	$ 45,779	$ 49,007
Weighted average maximum maturity (in years)	3 years 1 month 6 days	3 years 3 months 18 days
Unfunded Commitments
Other Commitments [Line Items]
Weighted average maximum maturity (in years)	1 year 4 months 24 days

X

- Definition

Financing Receivable, Unfunded Loan Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Loans Receivable, Weighted Average Term Of Maturity

+ References

No definition available.

+ Details

Name:	sevn_LoansReceivableWeightedAverageTermOfMaturity
Namespace Prefix:	sevn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: