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Accounts Receivable - Allowance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period $ 647 $ 379 $ 353 $ 264
Provisions (recoveries) for losses on accounts receivables, net of adjustments (218) 13 76 128
Balance, end of period $ 429 $ 392 $ 429 $ 392