Commitment and Contingencies - Future Minimum Sale Leaseback Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Remainder of 2022	$ 1,039	$ 1,385
2023	1,385	1,385
2024	1,240	1,240
2025	387	387
2026	0
Thereafter	0	0
Total future minimum financing payments	$ 3,451	$ 4,397

Minimum Lease Payments, Sale Leaseback Transactions1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactions1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, After Year Four1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsAfterYearFour1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, Remainder of Fiscal Year1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsRemainderOfFiscalYear1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, within Four Years1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFourYears1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, within One Year1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, within Three Years1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum Lease Payments, Sale Leaseback Transactions, within Two Years1

No definition available.

Name:	blze_MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears1
Namespace Prefix:	blze_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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