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Other Assets - Loan to a Hardware Supplier (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 15, 2019
Jun. 24, 2019
Mar. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Payments to acquire notes receivable             $ 26,074,000 $ 0    
Expense (reversal) related to promissory note             (3,319,000) 0    
Interest income       $ 2,703,000   $ 661,000 4,317,000 $ 1,442,000    
Notes Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loan, interest rate     13.00%              
Payments to acquire notes receivable     $ 16,400,000              
Accrued contingent liability       6,000,000.0     6,000,000.0      
Fair value of acquired promissory note     $ 22,400,000              
Hardware Supplier                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Receipt of payment on notes receivable $ 25,000,000.0 $ 7,400,000                
Conversion of outstanding notes receivable $ 5,600,000                  
Interest income       1,700,000     1,700,000      
Gain recorded within other income, net       6,900,000     6,900,000      
Hardware Supplier | Notes Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Notes receivable, maximum available                 $ 7,400,000  
Loan, interest rate                 12.00%  
Interest rate, payable in cash                 6.00%  
Interest rate, payable in kind                 6.00%  
Hardware Supplier | Other Current Assets | Notes Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loan receivable, current       $ 0     $ 0      
Hardware Supplier | Other Assets | Notes Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Loan receivable, noncurrent                   $ 3,300,000
Hardware Supplier | Notes Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Payment from supplier   $ 7,400,000                
Expense (reversal) related to promissory note         $ (3,300,000)          
Hardware Supplier | Other Third-Party Secured Creditor                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Outstanding balance                   $ 26,600,000