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Commitments and Contingencies - Summary of Contractual Obligation Fiscal Year Maturity Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Inventory purchases related to purchase obligations	$ 46	$ 346	$ 150	$ 4,088	$ 4,300	$ 4,400

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- Definition

Inventory purchases related to purchase obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	bzai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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