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Debt - Mitsubishi Bank and Yamanashi Chuo Bank Loans (Details) - Mitsubishi Bank and The Yamanashi Chuo Bank, Ltd. - Term Loan C
$ in Millions
1 Months Ended
Jan. 31, 2018
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
JPY (¥)
Jan. 31, 2018
JPY (¥)
Debt Instrument [Line Items]        
Credit facility, maximum borrowing amount $ 7.6     ¥ 850,000,000
Debt term 82 months      
Long-term debt   $ 3.8 ¥ 425,000,000  
TIBOR        
Debt Instrument [Line Items]        
TIBOR interest rate spread 1.00%