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Stock-Based Compensation - Narrative 1 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |  |
Capitalized stock-based compensation | $ 316 | $ 157

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- Definition Capitalized Stock-Based Compensation + References No definition available. + Details
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Namespace Prefix: | bksy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration