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Organization and Presentation	12 Months Ended
Organization and Presentation	Dec. 31, 2015
Accounting Policies [Abstract]
Organization and Presentation	1. Organization and Presentation GSI Group Inc. and its subsidiaries (collectively referred to as the “Company”, “we”, “us”, “our”) design, develop, manufacture and sell precision photonic and motion control components and subsystems to Original Equipment Manufacturers (“OEM’s”) in the medical and advanced industrial markets. Our highly engineered enabling technologies include CO2 laser sources, laser scanning and beam delivery products, optical data collection and machine vision technologies, medical visualization and informatics solutions, and precision motion control products. We specialize in collaborating with OEM customers to adapt our component and subsystem technologies to deliver highly differentiated performance in their applications. Basis of Presentation These consolidated financial statements have been prepared by the Company in U.S. dollars and in accordance with U.S. generally accepted accounting principles, applied on a consistent basis. The consolidated financial statements include the accounts of GSI Group Inc. and its wholly owned subsidiaries. Intercompany accounts and transactions have been eliminated. In 2015, the Company’s 50% owned joint venture, Excel Laser Technology Private Limited (the “India JV”), was deconsolidated as the Company sold 100% of its interest in the India JV. The accounts of the India JV were previously included in discontinued operations in the consolidated financial statements. The Company has a 41% ownership interest in Laser Quantum Ltd. (“Laser Quantum”), a privately held company located in the United Kingdom. The Company records the results of this entity under the equity method as it does not have a controlling interest in the entity.