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Summary of Significant Accounting Policies - Equity Method Investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]        
Loss on equity method investment $ (831) $ 0 $ 0  
Equity method investment 8,169 0    
Capital contributed 9,000 $ 0 $ 0  
WorkLLama, LLC        
Schedule of Equity Method Investments [Line Items]        
Percent ownership of equity method investment       50.00%
Loss on equity method investment (800)      
Equity method investment 8,200      
Contingent payments liability, maximum 22,500      
Capital contributed $ 9,000