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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) ¥ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 26, 2016 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Factory transition restructuring charges |  | $ 6,145,000 | $ 4,493,000 | $ 0
Assets held for sale |  | 12,517,000 | 0 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Guangzhou Factory |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Consideration | ¥ 320 | 49,000,000 |  |
Period to cease operations (up to) | 24 months |  |  |
Expected term of completion | 28 months |  |  |
Escrow deposit as percentage of purchase price | 10.00% |  |  |
Assets held for sale |  | 12,500,000 |  |
Employee Severance | Manufacturing Activities Transition | Operating Expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Factory transition restructuring charges |  | 6,100,000 | $ 4,500,000 |
Employee Severance | Manufacturing Activities Transition | Employee-related Liabilities, Current |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Unpaid restructuring costs |  | $ 0 |  |

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