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v3.23.1

Management Agreement with Tremont (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 USD ($) employee | Mar. 31, 2022 USD ($)
Related Party Transactions [Abstract] |  |
Number of employees | employee | 0 |
Quarterly base management fee (as a percent) | 0.375% |
Annualized base management fee (as a percent) | 1.50% |
Base management fees | $ 1,072 | $ 1,063
Incentive fee | 0 | 0
Reimbursement of shared services expenses | $ 643 | $ 634

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- Definition Number of persons employed by the Entity + References No definition available. + Details
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Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Base Management Fee + References No definition available. + Details
Name: | sevn_BaseManagementFee
Namespace Prefix: | sevn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Base Management Fee, Percent Fee, Annualized + References No definition available. + Details
Name: | sevn_BaseManagementFeePercentFeeAnnualized
Namespace Prefix: | sevn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Base Management Fee, Percent Fee, Quarterly + References No definition available. + Details
Name: | sevn_BaseManagementFeePercentFeeQuarterly
Namespace Prefix: | sevn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Management Incentive Fee + References No definition available. + Details
Name: | sevn_ManagementIncentiveFee
Namespace Prefix: | sevn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reimbursement Of Shared Services Expenses + References No definition available. + Details
Name: | sevn_ReimbursementOfSharedServicesExpenses
Namespace Prefix: | sevn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration