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Bank Borrowing (Details)
$ in Thousands
1 Months Ended 85 Months Ended
May 09, 2018
CNY (¥)
Aug. 15, 2017
USD ($)
Jul. 31, 2018
USD ($)
Jan. 31, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2018
USD ($)
May 09, 2018
USD ($)
May 01, 2018
USD ($)
Capital lease liability                
2019 (Remaining)           $ 6,549    
2020           14,201    
2021           17,777    
2022           16,907    
2023           12,255    
Thereafter           0    
Total minimum lease payments           67,689    
Less amount representing interest           (8,871)    
Total capital lease liabilities           58,818    
Maturities of debt                
2019 (Remaining)           6,255    
2020           8,340    
2021           8,340    
2022           8,340    
2023           16,028    
Total debt, excluding debt issuance costs           47,303    
Less: debt issuance costs           (257)    
Total debt, less debt issuance costs           47,046    
Secured Debt                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 17,800
Amount outstanding           17,500    
Stated percentage               5.04%
Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 30,000            
Debt instrument, term   5 years            
Amount outstanding           29,800    
Proceeds from lines of credit     $ 16,700 $ 13,200        
Minimum | London Interbank Offered Rate (LIBOR) | Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.75%            
Maximum | London Interbank Offered Rate (LIBOR) | Term Loan | Secured Debt | Variable Interest Rate Term Loan Maturing August 2022                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.25%            
YinHai Leasing Company and China Import/Export Bank [Member] | Lease Financing [Member]                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity ¥ 400,000,000           $ 62,800  
Nominal sale amount at end of lease term | ¥ ¥ 1              
Amount outstanding         ¥ 400,000,000 $ 58,200    
China | YinHai Leasing Company and China Import/Export Bank [Member] | Base Rate [Member] | Lease Financing [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate, multiple 1.15           1.15  
Basis spread on variable rate 5.4625%