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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Apr. 26, 2018 USD ($) | Apr. 26, 2018 CNY (¥) | Apr. 23, 2018 USD ($) | Apr. 23, 2018 CNY (¥) | Sep. 26, 2016 USD ($) | Sep. 26, 2016 CNY (¥)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Factory transition restructuring charges | $ 0 | $ 5,250 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Nonrefundable deposit |  |  | $ 5,400 | ¥ 34 |  |  |  |
Consideration receivable upon government approvals |  |  | 37,700 | 237 |  |  |  |
Escrow deposit |  |  | $ 10,800 | ¥ 68 |  |  |  |
Guangzhou Factory | Disposed of by Sale |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Consideration received in sale |  |  |  |  |  |  | $ 50,800 | ¥ 320
Escrow deposit as percentage of purchase price |  |  |  |  |  |  | 10.00% | 10.00%
Guangzhou Factory | Disposed of by Sale | Subsequent Event |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Consideration received in sale |  |  |  |  | $ 53,800 | ¥ 339 |  |
Employee Severance | Manufacturing Activities Transition | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Factory transition restructuring charges |  | $ 5,300 |  |  |  |  |  |

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