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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Basis of Presentation - Additional information (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Jan. 10, 2017	Jan. 09, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2017
Basis Of Presentation [Line Items]
Accumulated deficit					$ 112,167		$ 127,740
ASU 2017-07
Basis Of Presentation [Line Items]
Reclassification of net periodic benefit cost			$ 100	$ 300
ASU 2016-16
Basis Of Presentation [Line Items]
Reclassification of prepaid income taxes and income taxes receivable						$ 2,500
Accumulated deficit						2,200
Deferred tax assets, net						$ 300
Laser Quantum
Basis Of Presentation [Line Items]
Equity method investment ownership percentage on Laser Quantum	76.00%	41.00%
Percentage of additional shares acquired	35.00%