Name:	sgbx_DescriptionOfSeparationAndDistributionOfBusinessLineItems
Namespace Prefix:	sgbx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The basic number of shares held by each stockholder of the parent was calculated for the distribution of the subsidiary's shares on a stock transaction.

No definition available.

Name:	sgbx_SaleOfStockBasicNumberOfSharesHeldByEachStockholderOfParentWasCalculatedForDistribution
Namespace Prefix:	sgbx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The date on which the subsidiary's securities are listed on an exchange, in YYYY-MM-DD format.

No definition available.

Name:	sgbx_SaleOfStockListingDate
Namespace Prefix:	sgbx_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

The number of publicly traded companies listed on an exchange after separation.

No definition available.

Name:	sgbx_SaleOfStockNumberOfPubliclyTradedCompaniesAfterSeparation
Namespace Prefix:	sgbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The nominal number of subsidiary's shares to be distributed to each stockholder of the parent company on a stock transaction.

No definition available.

Name:	sgbx_SaleOfStockNumberOfSharesToBeDistributedToEachStockholderOfParent
Namespace Prefix:	sgbx_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The percentage of shares issued or sold by the subsidiary in a stock transaction.

No definition available.

Name:	sgbx_SaleOfStockPercentageOfOwnershipSharesSoldOnTransaction
Namespace Prefix:	sgbx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The record date for the distribution of a subsidiary's shares to the stockholders of the parent entity, in YYYY-MM-DD format.

No definition available.

Name:	sgbx_SaleOfStockRecordDateForDistribution
Namespace Prefix:	sgbx_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

The subsidiary's trading symbol of an instrument as listed on an exchange.

No definition available.

Name:	sgbx_SaleOfStockTradingSymbolOfSubsidiary
Namespace Prefix:	sgbx_
Data Type:	xbrli:normalizedStringItemType
Balance Type:	na
Period Type:	duration

Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B

Name:	us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of gain (loss) from remeasurement to fair value of retained investment in former subsidiary and group of assets constituting business or nonprofit activity deconsolidated and derecognized, excluding conveyance of oil and gas mineral rights and transfer of product or service in contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B

Name:	us-gaap_DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Date the subsidiary or equity investee issued or sold stock, in YYYY-MM-DD format.

No definition available.