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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 26, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Apr. 26, 2018 USD ($) | Apr. 26, 2018 CNY (¥) | Apr. 23, 2018 USD ($) | Apr. 23, 2018 CNY (¥) | Sep. 26, 2016 CNY (¥)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Factory transition restructuring charges |  | $ 0 | $ 449 | $ 0 | $ 5,699 |  |  |  |  |
Nonrefundable deposit |  |  |  |  |  | $ 5,100 | ¥ 34 |  |  |
Consideration receivable upon government approvals |  |  |  |  |  | 35,800 | 237 |  |  |
Escrow deposit |  |  |  |  |  | $ 10,300 | ¥ 68 |  |  |
Gain on sale of Guangzhou factory | $ 37,000 | $ 36,978 | 0 | $ 36,978 | 0 |  |  |  |  |
Net gain on disposal | $ 32,100 |  |  |  |  |  |  |  |  |
Guangzhou Factory | Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration received in sale |  |  |  |  |  |  |  | $ 51,400 | ¥ 339 | ¥ 320
Escrow deposit as percentage of purchase price |  |  |  |  |  |  |  |  |  | 10.00%
Employee Severance | Manufacturing Activities Transition | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Factory transition restructuring charges |  |  | $ 400 |  | $ 5,700 |  |  |  |  |

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