Contingencies	9 Months Ended
Oct. 03, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies	: Legal Matters On or about January 29, 2015, Silicon Image, members of its Board, the Company and the Company’s wholly-owned merger acquisition subsidiary were named as defendants in two complaints filed in Santa Clara Superior Court by alleged stockholders of Silicon Image in connection with the proposed merger of Silicon Image and the Company. Both complaints were dated January 29, 2015 and were captioned respectively Molland v. George, et al. and Stein v. Silicon Image, Inc. et. al. Five additional complaints were subsequently filed on January 30, 2015, February 4, 2015 and February 9, 2015 in Delaware Chancery Court by alleged stockholders of Silicon Image, Inc. in connection with the Merger, captioned respectively Pfeiffer v. Martino et. al.; Lipinski v. Silicon Image, Inc. et. al.; Feldbaum et. al. v. Silicon Image, Inc. et. al; Nelson v. Silicon Image, Inc. et. al. and Partansky v. Silicon Image, Inc. et. al. The five Delaware matters were subsequently consolidated into an action captioned In re Silicon Image Stockholders Litigation by order of the Delaware Chancery Court on February 11, 2015, and a consolidated amended complaint was filed in the matter on February 13, 2015. Two complaints captioned Tapia v. Silicon Image, Inc. et. al. and Caldwel v. Silicon Image, Inc. were also filed on February 4, 2015 and February 9, 2015 in Santa Clara Superior Court by alleged stockholders in connection with the merger. Amended complaints were filed in the Molland and Stein actions on February 11, 2015. Each of these lawsuits are purported class actions brought on behalf of Silicon Image stockholders, asserting claims against each member of the Silicon Image Board for breach of fiduciary duty, and against various officers of the Silicon Image, the Company, and the Company’s wholly-owned merger subsidiary for aiding and abetting breach of fiduciary duty. The lawsuits allege that the Merger does not appropriately value Silicon Image, was the result of an inadequate process, and includes preclusive deal devices. The amended complaints also assert that the Silicon Image’s disclosures regarding the Merger in its Schedule 14D-9 omitted material information regarding the Merger. Each of these complaints purport to seek unspecified damages. The California cases are ongoing, but have been granted a motion to stay. The parties have reached a tentative settlement in the Delaware case, subject to final court approval. We have estimated a range of possible loss for this settlement, but consider the resulting accrual under U.S. GAAP to be immaterial to our Consolidated Statements of Operations. In November 2014, a patent infringement lawsuit was filed by Papst Licensing GmbH & Co., KG ("Papst") against us in the U.S. District Court for the District of Delaware. On September 21, 2015, the parties entered into a settlement agreement. Under that agreement, we received a non-exclusive, irrevocable, fully paid up, perpetual, worldwide license for use of the asserted patents. The license fully exhausts and includes all claims of the asserted patents. The settlement did not have a material adverse effect on our financial position. On October 22, 2015, the case was dismissed with prejudice. In March 2014, the China National Development and Reform Commission ("NDRC") notified HDMI Licensing, LLC ("HDMI LLC"), a wholly-owned subsidiary of the Company and the agent for and entity charged with administering the HDMI specification, that the NDRC was investigating HDMI LLC’s licensing activities in China under the Chinese Anti-Monopoly Law ("AML"). The NDRC has available a broad range of remedies with respect to business practices it deems to violate the AML, including the ability to issue an order to cease conduct deemed illegal, confiscate gains deemed illegally obtained, impose a fine and require modifications to business practices. In July 2015, the NDRC concluded its investigation and informed HDMI LLC that it did not intend to impose monetary penalties on HDMI LLC, subject to HDMI LLC entering into a settlement agreement with the China Video Industry Association (“CVIA”) relating to various issues arising in connection with HDMI LLC licensing to Chinese companies. HDMI LLC is negotiating the specific implementation terms of this agreement with CVIA. Lattice cannot predict the outcome of this matter because administrative proceedings and negotiations with industry associations are inherently uncertain. At this stage of the proceedings, we do not have an estimate of the likelihood or the amount of any financial consequences to the Company. We are exposed to certain other asserted and unasserted potential claims. There can be no assurance that, with respect to potential claims made against us, we could resolve such claims under terms and conditions that would not have a material adverse effect on our business, our liquidity or our financial results. Periodically, we review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, we then accrue a liability for the estimated loss based on the provisions of FASB ASC 450, “Contingencies" (“ASC 450”). Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and may revise estimates.

Legal Matters

On or about January 29, 2015, Silicon Image, members of its Board, the Company and the Company’s wholly-owned merger acquisition subsidiary were named as defendants in two complaints filed in Santa Clara Superior Court by alleged stockholders of Silicon Image in connection with the proposed merger of Silicon Image and the Company. Both complaints were dated January 29, 2015 and were captioned respectively Molland v. George, et al. and Stein v. Silicon Image, Inc. et. al. Five additional complaints were subsequently filed on January 30, 2015, February 4, 2015 and February 9, 2015 in Delaware Chancery Court by alleged stockholders of Silicon Image, Inc. in connection with the Merger, captioned respectively Pfeiffer v. Martino et. al.; Lipinski v. Silicon Image, Inc. et. al.; Feldbaum et. al. v. Silicon Image, Inc. et. al; Nelson v. Silicon Image, Inc. et. al. and Partansky v. Silicon Image, Inc. et. al. The five Delaware matters were subsequently consolidated into an action captioned In re Silicon Image Stockholders Litigation by order of the Delaware Chancery Court on February 11, 2015, and a consolidated amended complaint was filed in the matter on February 13, 2015. Two complaints captioned Tapia v. Silicon Image, Inc. et. al. and Caldwel v. Silicon Image, Inc. were also filed on February 4, 2015 and February 9, 2015 in Santa Clara Superior Court by alleged stockholders in connection with the merger. Amended complaints were filed in the Molland and Stein actions on February 11, 2015. Each of these lawsuits are purported class actions brought on behalf of Silicon Image stockholders, asserting claims against each member of the Silicon Image Board for breach of fiduciary duty, and against various officers of the Silicon Image, the Company, and the Company’s wholly-owned merger subsidiary for aiding and abetting breach of fiduciary duty. The lawsuits allege that the Merger does not appropriately value Silicon Image, was the result of an inadequate process, and includes preclusive deal devices. The amended complaints also assert that the Silicon Image’s disclosures regarding the Merger in its Schedule 14D-9 omitted material information regarding the Merger. Each of these complaints purport to seek unspecified damages. The California cases are ongoing, but have been granted a motion to stay. The parties have reached a tentative settlement in the Delaware case, subject to final court approval. We have estimated a range of possible loss for this settlement, but consider the resulting accrual under U.S. GAAP to be immaterial to our Consolidated Statements of Operations.

In November 2014, a patent infringement lawsuit was filed by Papst Licensing GmbH & Co., KG ("Papst") against us in the U.S. District Court for the District of Delaware. On September 21, 2015, the parties entered into a settlement agreement. Under that agreement, we received a non-exclusive, irrevocable, fully paid up, perpetual, worldwide license for use of the asserted patents. The license fully exhausts and includes all claims of the asserted patents. The settlement did not have a material adverse effect on our financial position. On October 22, 2015, the case was dismissed with prejudice.

In March 2014, the China National Development and Reform Commission ("NDRC") notified HDMI Licensing, LLC ("HDMI LLC"), a wholly-owned subsidiary of the Company and the agent for and entity charged with administering the HDMI specification, that the NDRC was investigating HDMI LLC’s licensing activities in China under the Chinese Anti-Monopoly Law ("AML"). The NDRC has available a broad range of remedies with respect to business practices it deems to violate the AML, including the ability to issue an order to cease conduct deemed illegal, confiscate gains deemed illegally obtained, impose a fine and require modifications to business practices. In July 2015, the NDRC concluded its investigation and informed HDMI LLC that it did not intend to impose monetary penalties on HDMI LLC, subject to HDMI LLC entering into a settlement agreement with the China Video Industry Association (“CVIA”) relating to various issues arising in connection with HDMI LLC licensing to Chinese companies. HDMI LLC is negotiating the specific implementation terms of this agreement with CVIA. Lattice cannot predict the outcome of this matter because administrative proceedings and negotiations with industry associations are inherently uncertain. At this stage of the proceedings, we do not have an estimate of the likelihood or the amount of any financial consequences to the Company.

We are exposed to certain other asserted and unasserted potential claims. There can be no assurance that, with respect to potential claims made against us, we could resolve such claims under terms and conditions that would not have a material adverse effect on our business, our liquidity or our financial results. Periodically, we review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, we then accrue a liability for the estimated loss based on the provisions of FASB ASC 450, “Contingencies" (“ASC 450”). Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and may revise estimates.