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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Oct. 01, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Reserves for accounts receivable | $ 1,279 | $ 873
Common stock, par value | $ 0.002 | $ 0.002
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares issued | 86,587,000 | 85,939,000

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