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Subsequent Events - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 16, 2020
Dec. 31, 2019
Subsequent Event [Line Items]    
Payments to acquire business   $ 19,139
Auto List, Inc | San Francisco, California    
Subsequent Event [Line Items]    
Acquisition-related costs incurred   $ 400
Auto List, Inc | Subsequent Event | San Francisco, California    
Subsequent Event [Line Items]    
Business acquisition date Jan. 16, 2020  
Payments to acquire business $ 22,000  
Amount held in escrow $ 2,200