Quarterly report pursuant to Section 13 or 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
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]      
Customer receivables $ 58,201 $ 79,899 $ 66,400
Other receivables 968 23  
Rebates receivable 3,168 957  
Allowance for doubtful accounts (2,337) (3,151)  
Total $ 60,000 $ 77,728