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Accounts Receivable - Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, beginning of period $ 353 $ 264
Provisions for losses on accounts receivables, net of adjustments 294 115
Balance, end of period $ 647 $ 379