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Debt - Chinese Credit Facilities - Additional Information (Details) - Chinese Credit Facilities
3 Months Ended
Mar. 31, 2019
USD ($)
CreditFacility
Mar. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Number of credit facilities | CreditFacility 2    
Outstanding borrowings $ 0   $ 0
Chinese Credit Facility Boa      
Debt Instrument [Line Items]      
Borrowing capacity under Credit Facility $ 30,000,000    
Period of credit facility 1 year    
Chinese Credit Facility JPM      
Debt Instrument [Line Items]      
Borrowing capacity under Credit Facility $ 10,000,000 ¥ 70,000,000  
Period of credit facility 1 year