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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 3 Months Ended
Aug. 03, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Oct. 31, 2016
USD ($)
Oct. 31, 2016
CNY (¥)
China Credit Agreement            
Debt Instrument [Line Items]            
Guarantor obligation   108.50%        
Subsequent Event | Line of Credit | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Amount available under the credit agreement $ 45,313,000          
Subsequent Event | Line of Credit | Second Amended China Credit Facility, Overdraft Sublimit            
Debt Instrument [Line Items]            
Long-term line of credit 0          
Revolving Credit Facility | Line of Credit | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Interest rate multiplier for variable rate   115.00%        
Interest rate, effective percentage   5.00%        
Proceeds from lines of credit   $ 0        
Repayments of lines of credit   0        
Long-term line of credit   0        
Amount available under the credit agreement   $ 45,313,000        
Revolving Credit Facility | Subsequent Event | Line of Credit | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Proceeds from lines of credit $ 0          
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 45,313,000 ¥ 300,000,000
Line of credit facility sublimit         $ 7,552,000 ¥ 50,000,000
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility, Overdraft Sublimit            
Debt Instrument [Line Items]            
Line of credit facility overdraft facility sublimit     $ 15,104,000 ¥ 100,000,000    
People's Bank Of China | Revolving Credit Facility | Line of Credit | 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