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Management Agreement with Tremont (Details)	Mar. 31, 2024 employee
Related Party Transactions [Abstract]
Number of employees	0
Quarterly base management fee (as a percent)	0.375%
Annualized base management fee (as a percent)	1.50%

X

- 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

X

- Definition

Base Management Fee, Percent Fee, Annualized

+ References

No definition available.

+ Details

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Namespace Prefix:	sevn_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Base Management Fee, Percent Fee, Quarterly

+ References

No definition available.

+ Details

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Namespace Prefix:	sevn_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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