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Revolving Credit Facilities and Mortgage Payable - Japan Line of Credit (Details) - Japan Credit Facility
1 Months Ended 9 Months Ended
Mar. 31, 2016
JPY (¥)
Dec. 31, 2019
USD ($)
Feb. 06, 2020
JPY (¥)
Feb. 06, 2020
USD ($)
Mar. 31, 2016
USD ($)
Notes Payable and Long-Term Debt          
Maximum borrowing capacity ¥ 5,500,000,000       $ 50,622,000
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      
Long-term line of credit   0      
Amount available under the credit agreement   $ 50,622,000      
Subsequent Event          
Notes Payable and Long-Term Debt          
Maximum borrowing capacity     ¥ 3,000,000,000 $ 27,612,000