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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details) - Line of Credit - Revolving Credit Facility
1 Months Ended 9 Months Ended
Aug. 31, 2013
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2013
CNY (¥)
Second Amended China Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 45,581,000   ¥ 300,000,000
Interest rate, effective percentage   4.24%  
Proceeds from lines of credit   $ 9,627,000  
Long-term line of credit   0  
Outstanding bank guarantees   30,000  
Amount available under the credit agreement   $ 45,551,000  
Second Amended China Credit Facility, Overdraft Sublimit      
Debt Instrument [Line Items]      
Line of credit facility overdraft facility sublimit $ 15,194,000   ¥ 100,000,000
China Credit Agreement      
Debt Instrument [Line Items]      
Guarantor obligation 108.50%    
Maximum | Second Amended China Credit Facility      
Debt Instrument [Line Items]      
Debt instrument term 12 months