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Business Description, Basis of Presentation and Significant Accounting Policies - Allowance for Doubtful Accounts Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts activity    
Balance at beginning of the year $ 424 $ 631
Allowance increase 120 92
Write offs, net of recoveries (38) (299)
Balance at end of the year $ 506 $ 424