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

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Organization and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands				12 Months Ended
	Sep. 27, 2018	Jan. 10, 2017	Jan. 09, 2017	Dec. 31, 2017
Organization And Business Activities [Line Items]
Earnings from equity investment				$ 104
Laser Quantum
Organization And Business Activities [Line Items]
Equity method investment ownership percentage on Laser Quantum		76.00%	41.00%
Earnings from equity investment				$ 100
Percentage of outstanding shares acquired	24.00%	35.00%
Consideration transferred in cash and restricted stock for percentage of shares acquired	$ 45,100