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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 9 Months Ended
Jan. 29, 2020
USD ($)
Aug. 31, 2013
CNY (¥)
Dec. 31, 2019
USD ($)
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 $ 43,018,000      
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   $ 43,046,000
Interest rate, effective percentage     4.57%  
Proceeds from lines of credit     $ 19,318,000  
Repayments of lines of credit     13,299,000  
Long-term line of credit     6,019,000  
Outstanding bank guarantees     28,000  
Amount available under the credit agreement     $ 36,999,000  
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   $ 14,349,000
Line of Credit | Revolving Credit Facility | Subsequent Event | Second Amended China Credit Facility        
Debt Instrument [Line Items]        
Proceeds from lines of credit 6,019,000      
Outstanding bank guarantees $ 28,000      
Maximum | Second Amended China Credit Facility        
Debt Instrument [Line Items]        
Debt instrument term   12 months