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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 3 Months Ended
Aug. 31, 2013
CNY (¥)
Jun. 30, 2020
USD ($)
Aug. 31, 2013
USD ($)
China Credit Agreement      
Debt Instrument [Line Items]      
Guarantor obligation 108.50%    
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity ¥ 300,000,000   $ 42,425,000
Interest rate, effective percentage   4.24%  
Proceeds from lines of credit   $ 0  
Repayments of lines of credit   0  
Long-term line of credit   0  
Outstanding bank guarantees   28,000  
Amount available under the credit agreement   $ 42,397,000  
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility, Overdraft Sublimit      
Debt Instrument [Line Items]      
Line of credit facility overdraft facility sublimit ¥ 100,000,000   $ 14,142,000
Maximum | Second Amended China Credit Facility      
Debt Instrument [Line Items]      
Debt instrument term 12 months