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Variable Interest Entity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 27, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]            
Impairment charge on equity method investment     $ 1,535 $ 0    
Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Equity investments and advances to affiliates $ 1,800          
Convertible note payable   $ 500 500      
Ownership percentage 16.50%          
VIE loss, our portion   (100)        
Impairment charge on equity method investment     1,500      
Investment in VIE   $ 200 $ 200   $ 1,700 $ 1,700