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v3.22.1

Related Party Transactions - Narrative (Details) $ in Millions | Mar. 31, 2022 USD ($)
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Related Party Transactions [Abstract] |
Interest payable | $ 1.2

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