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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) ¥ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 26, 2016 CNY (¥) | Dec. 31, 2016 USD ($)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Guangzhou Factory |  |
Restructuring Cost and Reserve [Line Items] |  |
Consideration | ¥ 320 | $ 46.0
Period to cease operations (up to) | 24 months |
Expected term of completion | 28 months |
Escrow deposit as percentage of purchase price | 10.00% |
Employee Severance | Manufacturing Activities Transition |  |
Restructuring Cost and Reserve [Line Items] |  |
Additional restructuring expenses related to be incurred |  | 7.0
Employee Severance | Manufacturing Activities Transition | Selling, general and administrative |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses |  | 4.5
Employee Severance | Manufacturing Activities Transition | Employee-related Liabilities, Current |  |
Restructuring Cost and Reserve [Line Items] |  |
Unpaid restructuring costs |  | $ 2.7

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