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Related Party Transactions (Details Textual) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 USD ($) | Sep. 29, 2018 USD ($)
Powersem |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 0.2 | $ 0.6
Purchase from related party | 1.3 | 3.4
Receivable from related parties | 0.1 | 0.1
Payables to related parties | 0.2 | 0.2
EB Tech |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 0.1 | 0.1
Amount of transaction | 0.1 | 0.3
ATEC |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 0.6 | 0.6
Amount of transaction | $ 2.5 | $ 7.7
Powersem |  |
Related Party Transaction [Line Items] |  |
Ownership percentage | 45.00% | 45.00%
EB Tech |  |
Related Party Transaction [Line Items] |  |
Ownership percentage | 20.00% | 20.00%
ATEC |  |
Related Party Transaction [Line Items] |  |
Ownership percentage | 24.00% | 24.00%

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