COMMITMENTS AND CONTINGENCIES, Registration Rights (Details)	Sep. 14, 2020 Individuals
Registration and Stockholder Rights [Abstract]
Number of individuals can be nominated for election in board of directors by 50% funders share holder	3
Number of individuals can be nominated for election in board of directors by 30% funders share holder	2
Number of individuals can be nominated for election in board of directors by 20% funders share holder	1
Maximum [Member]
Registration and Stockholder Rights [Abstract]
Number of demands eligible security holder can make	2
Minimum [Member]
Registration and Stockholder Rights [Abstract]
Threshold percentage of outstanding registrable securities holder, to make demand	20.00%

Represents the number of demands eligible security holder can make.

No definition available.

Name:	sbg_NumberOfDemandsEligibleSecurityHolderCanMake
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Represents the number of individuals can be nominated for election in board of directors by 20% funders share holder.

No definition available.

Name:	sbg_NumberOfIndividualsCanBeNominatedForElectionInBoardOfDirectorsBy20FundersShareHolder
Namespace Prefix:	sbg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of individuals can be nominated for election in board of directors by 30% funders share holder.

No definition available.

Name:	sbg_NumberOfIndividualsCanBeNominatedForElectionInBoardOfDirectorsBy30FundersShareHolder
Namespace Prefix:	sbg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of individuals can be nominated for election in board of directors by 50% funders share holder.

No definition available.

Name:	sbg_NumberOfIndividualsCanBeNominatedForElectionInBoardOfDirectorsBy50FundersShareHolder
Namespace Prefix:	sbg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

No definition available.

Name:	sbg_RegistrationAndStockholderRightsAbstract
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Required percentage of outstanding registrable securities holder eligible to make demand.

No definition available.

Name:	sbg_ThresholdPercentageOfOutstandingRegistrableSecuritiesHolderToMakeDemand
Namespace Prefix:	sbg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: