This concept does not have a custom type definition

No definition available.

Name:	inn_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostToBeRecognizedAbstract
Namespace Prefix:	inn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards to be recognized in the remainder of the fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountRemainderOfFiscalYear
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Year One

+ References

No definition available.

+ Details

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountYearOne
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized cost of unvested share-based compensation awards to be recognized during the third fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountYearThree
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized cost of unvested share-based compensation awards to be recognized during the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountYearTwo
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

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

- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_TitleOfIndividualAxis=inn_NewDirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=inn_FormerExecutiveChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	inn_VestingCriteriaAxis=inn_VestingBasedOnServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	inn_VestingCriteriaAxis=inn_VestingBasedOnPerformanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

EQUITY-BASED COMPENSATION - Equity-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense				$ 5,840	$ 3,969
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	$ 10,883			10,883
2022	2,741			2,741
2023	4,886			4,886
2024	2,854			2,854
2025	402			$ 402
New Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				3,234
Granted (in dollars per share)				$ 9.94
Director stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				81,655
Granted (in dollars per share)				$ 9.43
Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	2,141		$ 2,400
Time-based restricted stock \| Former Executive Chairman
Compensation expense to be recognized
Additional stock-based compensation expense		$ 1,300
Director stock \| Corporate general and administrative \| Director stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	770		583	$ 802	583
Time-based restricted stock \| Time-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				316,643
Granted (in dollars per share)				$ 9.83
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	5,225			$ 5,225
2022	1,302			1,302
2023	2,334			2,334
2024	1,396			1,396
2025	193			193
Time-based restricted stock \| Time-based restricted stock \| Former Executive Chairman
Compensation expense to be recognized
Additional stock-based compensation expense		400
Time-based restricted stock \| Time-based restricted stock \| Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	651		843	$ 1,645	1,508
Performance-based restricted stock \| Time-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				306,435
Granted (in dollars per share)				$ 9.83
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	5,658			$ 5,658
2022	1,439			1,439
2023	2,552			2,552
2024	1,458			1,458
2025	209			209
Performance-based restricted stock \| Time-based restricted stock \| Former Executive Chairman
Compensation expense to be recognized
Additional stock-based compensation expense		$ 900
Performance-based restricted stock \| Time-based restricted stock \| Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 720		$ 974	$ 3,393	$ 1,878