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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details) - Line of Credit - Revolving Credit Facility
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2013
USD ($)
Mar. 31, 2021
USD ($)
Aug. 31, 2013
CNY (¥)
Second Amended China Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 45,736   ¥ 300,000,000
Interest rate, effective percentage   4.15%  
Proceeds from lines of credit   $ 9,659  
Repayments of lines of credit   9,659  
Long-term line of credit   0  
Current carrying value of guarantor obligations   30  
Amount available under the credit agreement   $ 45,706  
Second Amended China Credit Facility, Overdraft Sublimit      
Debt Instrument [Line Items]      
Line of credit facility overdraft facility sublimit $ 15,245   ¥ 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