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ACQUISITIONS - Pro forma (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
FRG Investment |  |
Business Acquisition [Line Items] |  |
Revenues | $ 1,643,600 | $ 1,080,670
Net (loss) income attributable to B. Riley Financial, Inc. | (105,750) | (168,970)
Net (loss) income attributable to common shareholders | $ (113,807) | $ (176,978)
Basic loss per share (in dollars per share) | $ (3.74) | $ (5.84)
Diluted loss per share (in dollars per share) | $ (3.74) | $ (5.84)
Weighted average basic shares outstanding (in shares) | 30,456,631 | 30,279,439
Weighted average diluted shares outstanding (in shares) | 30,456,631 | 30,279,439
Targus |  |
Business Acquisition [Line Items] |  |
Revenues |  | $ 1,418,291,000
Net (loss) income |  | (138,448,000)
Net (loss) income attributable to B. Riley Financial, Inc. |  | (141,683,000)
Net (loss) income attributable to common shareholders |  | $ (149,691,000)

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