Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Concentration of Credit Risk and Accounts Receivable (Narrative) (Details)

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Significant Accounting Policies - Concentration of Credit Risk and Accounts Receivable (Narrative) (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Cash held in banks outside of the United States $ 21,700,000 $ 28,200,000
Allowance for doubtful accounts $ 0 $ 0