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Investments - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
May 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]        
Purchase of debt     $ 2,216  
Aggregate carrying amount of investment   $ 9,400   $ 9,300
RepairPal, Inc. [Member]        
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]        
Ownership percentage   21.00%    
RepairPal, Inc. [Member] | Convertible Debt [Member]        
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]        
Purchase of debt $ 2,200      
Percentage of annual interest rate 7.00%      
Maturity date of debt 2018-05      
RepairPal, Inc. [Member] | Convertible Debt [Member] | Before May 2018 [Member]        
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]        
Debt instrument, conversion terms   The debt converts into shares of preferred stock upon the earlier of May 2018 or the date on which RepairPal raises proceeds of at least $5 million through a single or series of related transactions related to any sale of preferred stock    
Debt instrument, convertible type of security   preferred stock    
Expected proceeds through single or series of related transactions   $ 5,000