Organization and Nature of Business Operations	12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND NATURE OF BUSINESS OPERATIONS	NOTE 1 — ORGANIZATION AND NATURE OF BUSINESS OPERATIONS B. Riley Financial, Inc. and its subsidiaries (collectively, the "Company") provide investment banking and financial services to corporate, institutional and high net worth clients, and asset disposition, valuation and appraisal and capital advisory services to a wide range of retail, wholesale and industrial clients, as well as lenders, capital providers, private equity investors and professional services firms throughout the United States, Australia, Canada, and Europe and with the acquisitions of United Online, Inc. ("UOL") on July 1, 2016 and magicJack VocalTec Ltd. ("magicJack") on November 14, 2018, provide consumer Internet access and cloud communication services. The Company acquired a majority ownership of BR Brand Holding, LLC on October 28, 2019, through which the Company provides licensing of trademarks. The Company operates in five operating segments: (i) Capital Markets, through which the Company provides investment banking, corporate finance, securities lending, restructuring, consulting, research, sales and trading and wealth management services to corporate, institutional and high net worth clients; (ii) Auction and Liquidation, through which the Company provides auction and liquidation services to help clients dispose of assets that include multi-location retail inventory, wholesale inventory, trade fixtures, machinery and equipment, intellectual property and real property; (iii) Valuation and Appraisal, through which the Company provides valuation and appraisal services to clients with independent appraisals in connection with asset based loans, acquisitions, divestitures and other business needs; (iv) Principal Investments - United Online and magicJack, through which the Company provides consumer Internet access and related subscription services from United Online and cloud communication services primarily through the magicJack devices; and (v) Brands, through which the Company licenses trademarks.

Organization and Nature of Business Operations

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND NATURE OF BUSINESS OPERATIONS

NOTE 1 — ORGANIZATION AND NATURE OF BUSINESS OPERATIONS

B. Riley Financial, Inc. and its subsidiaries (collectively, the "Company") provide investment banking and financial services to corporate, institutional and high net worth clients, and asset disposition, valuation and appraisal and capital advisory services to a wide range of retail, wholesale and industrial clients, as well as lenders, capital providers, private equity investors and professional services firms throughout the United States, Australia, Canada, and Europe and with the acquisitions of United Online, Inc. ("UOL") on July 1, 2016 and magicJack VocalTec Ltd. ("magicJack") on November 14, 2018, provide consumer Internet access and cloud communication services. The Company acquired a majority ownership of BR Brand Holding, LLC on October 28, 2019, through which the Company provides licensing of trademarks.

The Company operates in five operating segments: (i) Capital Markets, through which the Company provides investment banking, corporate finance, securities lending, restructuring, consulting, research, sales and trading and wealth management services to corporate, institutional and high net worth clients; (ii) Auction and Liquidation, through which the Company provides auction and liquidation services to help clients dispose of assets that include multi-location retail inventory, wholesale inventory, trade fixtures, machinery and equipment, intellectual property and real property; (iii) Valuation and Appraisal, through which the Company provides valuation and appraisal services to clients with independent appraisals in connection with asset based loans, acquisitions, divestitures and other business needs; (iv) Principal Investments - United Online and magicJack, through which the Company provides consumer Internet access and related subscription services from United Online and cloud communication services primarily through the magicJack devices; and (v) Brands, through which the Company licenses trademarks.