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Revenue - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 198,764	$ 208,700
Launch Revenue
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	71,125	77,843
Spacecraft Solutions Revenue
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 127,639	$ 130,857

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(26)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=fly_LaunchRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=fly_SpacecraftSolutionsRevenueMember
Namespace Prefix:
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Balance Type:
Period Type: