Period After Full Vesting as Requirement for Redemption

No definition available.

Name:	sor_PeriodAfterFullVestingAsRequirementForRedemption
Namespace Prefix:	sor_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period After Vesting as Requirement for Redemption

+ References

No definition available.

+ Details

Name:	sor_PeriodAfterVestingAsRequirementForRedemption
Namespace Prefix:	sor_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Requirement of Redemption of Stock Percent at Net Asset Value Price of Share

+ References

No definition available.

+ Details

Name:	sor_RequirementOfRedemptionOfStockPercentAtNetAssetValuePriceOfShare
Namespace Prefix:	sor_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Requirement of Redemption of Stock Percent in Cash

+ References

No definition available.

+ Details

Name:	sor_RequirementOfRedemptionOfStockPercentInCash
Namespace Prefix:	sor_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Subordinated Performance Fee Due Upon Termination to Affiliate

+ References

No definition available.

+ Details

Name:	sor_SubordinatedPerformanceFeeDueUponTerminationToAffiliate
Namespace Prefix:	sor_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value portion of shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e21216-110875

+ Details

Name:	us-gaap_MandatorilyRedeemablePreferredStockFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

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

- Details

Name:	srt_CounterpartyNameAxis=sor_KbsCapitalAdvisorsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE-BASED COMPENSATION (Details) - USD ($)		12 Months Ended
SHARE-BASED COMPENSATION (Details) - USD ($)	Mar. 26, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subordinated performance fee due upon termination to affiliate		$ 32,640,000	$ 0	$ 0
Restricted Stock \| KBS Capital Advisors LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subordinated performance fee due upon termination to affiliate		32,600,000
Fair value of stock		$ 9.57
Restricted Stock \| KBS Capital Advisors LLC \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock (in shares)	3,411,737
Period after vesting as requirement for redemption	60 days
Requirement of redemption of stock percent in cash	50.00%
Period after full vesting as requirement for redemption	60 days
Requirement of redemption of stock percent at net asset value price of share	0.6667%