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Product Line Divestiture	9 Months Ended
Product Line Divestiture	Sep. 29, 2018
Discontinued Operations and Disposal Groups [Abstract]
Product Line Divestiture	Product Line Divestiture In February 2018, the Company sold its outdoor cabinet product line to Clearfield, Inc. (“Clearfield”) for $10.4 million in cash as well as the assumption by Clearfield of the related product warranty liabilities and open purchase order commitments with its contract manufacturer. The Company transferred $2.1 million in net inventory and agreed to solicit orders on Clearfield’s behalf on the newly transferred outdoor cabinets product lines free of charge for 15 months. The Company established a liability of $1.6 million in deferred revenue for providing this service and is amortizing this amount to service revenue over the corresponding 15-month period. The Company also recognized a $6.7 million gain for the nine months ended September 29, 2018 within operating expenses in the Condensed Consolidated Statements of Comprehensive Income (Loss).