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Revenue and Accounts Receivable, Net - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 1,492 $ 1,121 $ 1,064
Additions to costs and expenses 332 441 305
Cash receipts (157) 0 0
Write-offs/Foreign exchange effects (255) (70) (248)
Balance at end of period $ 1,412 $ 1,492 $ 1,121