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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