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v3.23.1

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 |

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- 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

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- Definition Loans Receivable, Weighted Average Term Of Maturity + References No definition available. + Details
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Namespace Prefix: | sevn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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

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