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Financing Arrangements - Japan Term Loan Facility (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
JPY (¥)
Aug. 31, 2020
JPY (¥)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Current portion of long-term debt   $ 14,599,000   $ 14,599,000       $ 7,317,000
Secured Debt | Japan Term Loan Facility                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 19,358,000 18,390,000   18,390,000   ¥ 1,900,000,000 ¥ 2,000,000,000  
Current portion of long-term debt   3,872,000   3,872,000   ¥ 400,000,000    
Interest expense, debt   $ 60,000 ¥ 6,226,000          
Debt instrument, periodic payment, principal       $ 968,000 ¥ 100,000,000      
Debt instrument term 5 years              
Asset-based credit facility, interest rate   0.91%   0.91%   0.91%    
Secured Debt | Japan Term Loan Facility | Tokyo Interbank Offered Rate (TIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate on debt       0.80% 0.80%