Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details)

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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance, beginning of period $ 3,179 $ 3,276
Allowances for bad debt 205 114
Issuance of credit memos and write offs (3,028) (211)
Balance, end of period $ 356 $ 3,179