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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 3 Months Ended
Jun. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Aug. 31, 2013
CNY (¥)
Jun. 30, 2019
USD ($)
Aug. 31, 2013
USD ($)
China Credit Agreement          
Debt Instrument [Line Items]          
Guarantor obligation     108.50%    
Line of Credit | Subsequent Event | Second Amended China Credit Facility          
Debt Instrument [Line Items]          
Amount available under the credit agreement   $ 43,681,000      
Line of Credit | Subsequent Event | Second Amended China Credit Facility, Overdraft Sublimit          
Debt Instrument [Line Items]          
Long-term line of credit   0      
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity     ¥ 300,000,000   $ 43,681,000
Interest rate, effective percentage 4.79%     4.79%  
Proceeds from lines of credit       $ 0  
Repayments of lines of credit       0  
Long-term line of credit $ 0     0  
Amount available under the credit agreement $ 43,681,000     $ 43,681,000  
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   $ 14,560,000
Line of Credit | Revolving Credit Facility | Subsequent Event | Second Amended China Credit Facility          
Debt Instrument [Line Items]          
Proceeds from lines of credit   $ 0      
People's Bank Of China | Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility          
Debt Instrument [Line Items]          
Interest rate multiplier for variable rate 4.35%        
Maximum | Second Amended China Credit Facility          
Debt Instrument [Line Items]          
Debt instrument term     12 months