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Net Loss Per Share - Schedule of computation of basic and dilutive net loss per share (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2025 shares
Earnings Per Share [Abstract]
RSUs vested that company is contractually obligated to issue	28,500
Restricted common stock, vested but unissued	1,944,865

X

- Definition

Restricted common stock vested but unissued.

+ References

No definition available.

+ Details

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Namespace Prefix:	bzai_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted stock units vested that contractually obligated to issue.

+ References

No definition available.

+ Details

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Namespace Prefix:	bzai_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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