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Leases - Narrative (Details)
$ in Thousands, ¥ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
May 09, 2018
CNY (¥)
May 09, 2018
USD ($)
Debt Instrument [Line Items]          
Operating lease, term of contract 10 years        
Operating lease liability     $ 34,087    
ROU assets associated with operating leases $ 35,371 $ 34,376 32,739    
Non-cash increase in right-of-use operating lease assets     $ 16,009    
Lease Financing | YinHai Leasing Company and China Import/Export Bank          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity       ¥ 400.0 $ 62,800
Amounts as reported          
Debt Instrument [Line Items]          
ROU assets associated with operating leases 19,362 18,667      
Non-cash increase in right-of-use operating lease assets 0 0      
Headquarters' Operating Lease Right of Use Asset and Liability | Adjustments          
Debt Instrument [Line Items]          
Operating lease liability 16,000        
ROU assets associated with operating leases 16,009 15,709      
Non-cash increase in right-of-use operating lease assets $ 16,000 $ 16,000