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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Savings Plan	Employee Savings Plan Under the Company’s Employee Savings Plan, a defined contribution plan, U.S. employees, who have attained age 21 and not defined as highly compensated, may contribute up to 50% of their pay on a pre-tax basis subject to the annual dollar limitations established by the Internal Revenue Service (IRS). Highly compensated employees as defined by the IRS, may contribute up to 25% of their pay on a pre-tax basis. The Company currently matches 50% of the first 6% of pay an employee contributes. Company contributions vest 20%, 40%, 60%, and 100% after two, three, four, and five years of continuous employment with the Company, respectively. Company contributions totaled $2,030,000 in 2017, $1,712,000 in 2016, and $1,845,000 in 2015. Cognex stock is not an investment alternative and Company contributions are not made in the form of Cognex stock.