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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