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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 26, 2016 CNY (¥) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Factory transition restructuring charges |  | $ 446 | $ 81 | $ 6,145 | $ 1,598 |
Assets held for sale |  | 12,403 |  | 12,403 |  | $ 0
Guangzhou Factory | Disposed of by sale |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Consideration | ¥ 320 | 48,000 |  | 48,000 |  |
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 |  | 12,400 |  | 12,400 |  |
Employee severance | Manufacturing activities transition | Accrued compensation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Unpaid severance costs |  | 200 |  | 200 |  |
Employee severance | Manufacturing activities transition | Selling, general and administrative expenses |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Factory transition restructuring charges |  | $ 400 | $ 100 | $ 6,100 | $ 1,600 |

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