Supplemental Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,406	$ 3,503
Insurance receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	96	744
Vendor rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	281	788
Franchise and other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,029	$ 1,971