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Debt - Chinese Credit Facilities - Additional Information (Details) - Chinese Credit Facilities
1 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Chinese Credit Facility Boa        
Debt Instrument [Line Items]        
Borrowing capacity under Credit Facility $ 30,000,000 $ 30,000,000    
Period of credit facility   1 year    
Outstanding borrowings 0 $ 0   $ 0
Chinese Credit Facility JPM        
Debt Instrument [Line Items]        
Borrowing capacity under Credit Facility $ 10,000,000 $ 10,000,000 ¥ 70,000,000  
Period of credit facility 1 year      
Outstanding borrowings       $ 0