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ACQUISITIONS - Pro forma (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Targus |  |
Business Acquisition [Line Items] |  |
Revenues | $ 1,418,291,000 | $ 1,887,385,000
Net (loss) income | (138,448,000) | 461,892,000
Net (loss) income attributable to B. Riley Financial, Inc. | (141,683,000) | 456,144,000
Net (loss) income attributable to common shareholders | (149,691,000) | 448,687,000
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

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