Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounts Receivable (Details)

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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Accounts receivable $ 1,020 $ 4,850
Less allowances for doubtful accounts (356) (3,179)
Accounts receivable, net $ 664 $ 1,671