Legal Proceedings	12 Months Ended
Dec. 31, 2011
Commitments and Contingencies and Legal Proceedings [Abstract]
LEGAL PROCEEDINGS	NOTE 19: LEGAL PROCEEDINGS In October 2011, Avid Technology, Inc. filed a complaint in the United States District court for the District of Delaware alleging that Harmonic’s Omneon Media Grid product infringes two patents held by Avid. The complaint seeks injunctive relief and damages. At this time, the Company cannot predict the outcome of this matter. An unfavorable outcome of this matter could adversely affect the Company’s business, operating results, financial position and cash flows. In April 2010, Arris Corporation filed a complaint in the United States District Court in Atlanta, alleging that the Company’s Streamliner 3000 product infringes four patents held by Arris. The complaint sought injunctive relief and damages. In connection with this matter, the Company recorded a $1.3 million liability in the fourth quarter of 2010, based on a tentative agreement of Arris and Harmonic with respect to the settlement of the action. In April 2011, this matter was settled on essentially the same terms as the tentative agreement and the action was dismissed. In March 2010, Interkey ELC Ltd, or Interkey, filed a lawsuit in Israel, alleging breach of contract against Harmonic and Scopus Video Networks Ltd. (now Harmonic Video Networks Ltd. or “HVN”), which was acquired by Harmonic in March 2009. The plaintiffs are seeking damages in the amount of 6,300,000 ILS (approximately $1.7 million). Although, as is the case with all litigation, no assurances can be given as to the outcome of the Interkey lawsuit, we believe Interkey’s and its shareholders’ claims are without merit and Harmonic and HVN intend to vigorously defend themselves against these claims. Based on the foregoing, as of December 31, 2011 and as of the date these financial statements were issued, we do not currently believe a loss is probable and have therefore not recorded a provision for this claim. An unfavorable outcome on the above referenced matters or any other litigation matters could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of the above referenced or other litigation matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows. Harmonic’s industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. From time to time, third parties have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or the Company’s customers. Such assertions arise in the normal course of the Company’s operations. The resolution of any such assertions and claims cannot be predicted with certainty.

Legal Proceedings

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies and Legal Proceedings [Abstract]

NOTE 19: LEGAL PROCEEDINGS

In October 2011, Avid Technology, Inc. filed a complaint in the United States District court for the District of Delaware alleging that Harmonic’s Omneon Media Grid product infringes two patents held by Avid. The complaint seeks injunctive relief and damages. At this time, the Company cannot predict the outcome of this matter. An unfavorable outcome of this matter could adversely affect the Company’s business, operating results, financial position and cash flows.

In April 2010, Arris Corporation filed a complaint in the United States District Court in Atlanta, alleging that the Company’s Streamliner 3000 product infringes four patents held by Arris. The complaint sought injunctive relief and damages. In connection with this matter, the Company recorded a $1.3 million liability in the fourth quarter of 2010, based on a tentative agreement of Arris and Harmonic with respect to the settlement of the action. In April 2011, this matter was settled on essentially the same terms as the tentative agreement and the action was dismissed.

In March 2010, Interkey ELC Ltd, or Interkey, filed a lawsuit in Israel, alleging breach of contract against Harmonic and Scopus Video Networks Ltd. (now Harmonic Video Networks Ltd. or “HVN”), which was acquired by Harmonic in March 2009. The plaintiffs are seeking damages in the amount of 6,300,000 ILS (approximately $1.7 million). Although, as is the case with all litigation, no assurances can be given as to the outcome of the Interkey lawsuit, we believe Interkey’s and its shareholders’ claims are without merit and Harmonic and HVN intend to vigorously defend themselves against these claims. Based on the foregoing, as of December 31, 2011 and as of the date these financial statements were issued, we do not currently believe a loss is probable and have therefore not recorded a provision for this claim.

An unfavorable outcome on the above referenced matters or any other litigation matters could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of the above referenced or other litigation matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

Harmonic’s industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. From time to time, third parties have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or the Company’s customers. Such assertions arise in the normal course of the Company’s operations. The resolution of any such assertions and claims cannot be predicted with certainty.