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Basis of Presentation - Additional information (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 27, 2018 | Jan. 10, 2017 | Jan. 09, 2017 | Sep. 29, 2017 | Sep. 29, 2017 | Sep. 28, 2018 | Mar. 30, 2018 | Dec. 31, 2017
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 90,736 |  | $ 127,740
ASU 2017-07 |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Reclassification of net periodic benefit cost |  |  |  | $ 100 | $ 400 |  |  |
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 outstanding shares acquired | 24.00% | 35.00% |  |  |  |  |  |
Consideration transferred in cash and restricted stock for percentage of shares acquired | $ 45,100 |  |  |  |  |  |  |

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