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Related Party Transactions - Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($)
Related Party Transactions [Abstract]
Interest payable	$ 2.8

X

- Definition

Interest Payable, Related Parties

+ References

No definition available.

+ Details

Name:	bksy_InterestPayableRelatedParties
Namespace Prefix:	bksy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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