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Accounts Receivable, net - Loss Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, net      
Balance at Beginning of year $ 190 $ 190 $ 290
Charges to earnings (190) 0 67
Amounts utilized / write-offs 0 0 (167)
Balance at end of year $ 0 $ 190 $ 190