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Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable    
Accounts receivable - contracts with customers $ 3,243 $ 3,061
Accounts receivable - ASC 842 9,802 6,963
Total Accounts Receivable 13,045 10,024
Less: Allowance for doubtful accounts (1,161) (918)
Total Accounts Receivable, net 11,884 9,106
Deferred income $ 1,103 $ 640