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Bank borrowings - Credit Facilities and Long-term Debt Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 28, 2020
Jun. 24, 2020
Apr. 26, 2020
USD ($)
Mar. 12, 2019
USD ($)
May 01, 2018
USD ($)
Aug. 15, 2017
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Mar. 31, 2019
CNY (¥)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
CNY (¥)
Apr. 26, 2020
CNY (¥)
Jun. 30, 2019
USD ($)
Mar. 12, 2019
CNY (¥)
Jul. 31, 2018
USD ($)
May 09, 2018
USD ($)
May 09, 2018
CNY (¥)
Jan. 12, 2018
USD ($)
Line of Credit Facility [Line Items]                                        
Long-term debt                       $ 129,889                
Restricted cash                       4,200     $ 2,400          
Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Maximum borrowing capacity         $ 17,800                              
Amount outstanding                       15,900                
Debt term         5 years                              
Stated interest rate         5.04%                              
Variable Interest Rate Term Loan Maturing August 2022 | Secured Debt | Term Loan                                        
Line of Credit Facility [Line Items]                                        
Maximum borrowing capacity           $ 30,000                            
Amount outstanding                       16,800         $ 16,700     $ 13,200
Debt term           5 years                            
Variable Interest Rate Term Loan Maturing August 2022 | Minimum [Member] | LIBOR | Secured Debt | Term Loan                                        
Line of Credit Facility [Line Items]                                        
Basis spread on variable rate           1.75%                            
Variable Interest Rate Term Loan Maturing August 2022 | Maximum [Member] | LIBOR | Secured Debt | Term Loan                                        
Line of Credit Facility [Line Items]                                        
Basis spread on variable rate           2.25%                            
YinHai Leasing Company and China Import/Export Bank | Lease Financing                                        
Line of Credit Facility [Line Items]                                        
Maximum borrowing capacity                                   $ 62,800 ¥ 400,000,000.0  
Sale leaseback transaction, nominal amount for selling equipment back to joint venture | ¥                                     ¥ 1  
Amount outstanding                       42,100 ¥ 298,000,000.0              
Finance lease term of contract                                   5 years 5 years  
YinHai Leasing Company and China Import/Export Bank | Lease Financing | China Five-Year Loan Prime Rate                                        
Line of Credit Facility [Line Items]                                        
Interest rate effective percentage 5.4625%                                      
Basis spread on variable rate 0.8125%                                      
China Development Bank, Agricultural Bank of China, China Merchant Bank and Chongqing Rural Commercial Bank | Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Maximum borrowing capacity     $ 35,700                     ¥ 250,000,000            
Amount outstanding                       35,300                
Proceeds from lines of credit             $ 35,300 ¥ 250,000,000                        
China Development Bank, Agricultural Bank of China, China Merchant Bank and Chongqing Rural Commercial Bank | China One-Year Loan Prime Rate | Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Basis spread on variable rate     1.30%                                  
China Development Bank | Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Basis spread on variable rate                 2.80%                      
Debt instrument, face amount                 $ 24,000                      
Long-term debt                       24,000                
Export-Import Bank Of China                                        
Line of Credit Facility [Line Items]                                        
Amount outstanding                       $ 27,400 ¥ 194,000,000              
Restricted cash       $ 2,000                       ¥ 14,000,000        
Export-Import Bank Of China | Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Maximum borrowing capacity       $ 29,800                       ¥ 200,000,000        
Proceeds from lines of credit | ¥                   ¥ 10,000,000 ¥ 190,000,000                  
China Base Rate multiplier       1.1                                
Interest rate during period including China Base Rate   5.39%   5.39%                                
Period for payments of principal       6 months                                
Repayments of lines of credit | ¥                   ¥ 6,000,000.0                    
Export-Import Bank Of China | China Five-Year Loan Prime Rate | Secured Debt                                        
Line of Credit Facility [Line Items]                                        
Basis spread on variable rate   0.74%                                    
China | YinHai Leasing Company and China Import/Export Bank | Lease Financing | Base Rate                                        
Line of Credit Facility [Line Items]                                        
Basis spread multiple                                   1.15 1.15  
Interest rate effective percentage                                   5.4625% 5.4625%