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Summary of Significant Accounting Policies - Adjustment to Prior Period Financial Statements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Increase in accounts receivable $ 771 $ 3,575
Increase in accrued liabilities $ (2,054) 2,777
Restatement Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Increase in accounts receivable   522
Increase in accrued liabilities   $ 522