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Accounts Receivable, net - Loss Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, net      
Balance at Beginning of year $ 290 $ 0 $ 1,395
Charges to earnings 67 290 155
Amounts utilized / write-offs (167) 0 (1,550)
Balance at end of year $ 190 $ 290 $ 0