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Long-Term Debt - Fujiitsu Note Payable (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2018	Oct. 01, 2018
OSA
Debt Instrument [Line Items]
Ownership percentage	100.00%	60.00%
Fujitsu Semiconductor Limited | Loans Payable
Debt Instrument [Line Items]
Principal amount of debt			$ 50,600,000

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