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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	DESCRIPTION OF BUSINESS Harmonic Inc. (“Harmonic” or the “Company”), the worldwide leader in visualized cable access and video delivery solutions, enables media companies and service providers to deliver ultra-high-quality video streaming and broadcast services to consumers globally. The Company revolutionized cable access networking via the industry’s first virtualized cable access solution, enabling cable operators to more flexibly deploy gigabit internet service to consumer’s homes and mobile devices. Whether simplifying video delivery via innovative cloud and software platforms, or powering the delivery of gigabit internet cable services, Harmonic is changing the way media companies and service providers monetize live and on-demand content on every screen. The Company operates in two segments, Video and Cable Access. The Video business sells video processing and production and playout solutions and services worldwide to cable operators and satellite and telecommunications (“telco”) pay-TV service providers, which are collectively referred to as “service providers,” and to broadcast and media companies, including streaming media companies. The Video business infrastructure solutions are delivered either through shipment of our products, software licenses or as software-as-a-service (“SaaS”) subscriptions. The Cable Access business sells cable access solutions and related services, including our CableOS software-based cable access solution, primarily to cable operators globally.