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Revolving Credit Facilities and Mortgage Payable - Japan Line of Credit (Details) - Japan Credit Facility
1 Months Ended 3 Months Ended
Jul. 31, 2019
USD ($)
Mar. 31, 2016
JPY (¥)
Jun. 30, 2019
USD ($)
Mar. 31, 2016
USD ($)
Notes Payable and Long-Term Debt        
Maximum borrowing capacity   ¥ 5,500,000,000   $ 50,928,000
Maximum        
Notes Payable and Long-Term Debt        
Debt instrument term   6 months    
Tokyo Interbank Offered Rate (TIBOR)        
Notes Payable and Long-Term Debt        
Spread on variable interest rate (as a percent)   0.40%    
Interest rate, effective percentage     0.47%  
Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Proceeds from lines of credit     $ 0  
Repayments of lines of credit     0  
Current borrowing capacity     0  
Amount available under the credit agreement     $ 50,928,000  
Subsequent Event | Line of Credit        
Notes Payable and Long-Term Debt        
Amount available under the credit agreement $ 50,928,000      
Long-term line of credit 0      
Subsequent Event | Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Proceeds from lines of credit $ 0