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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 13, 2018
Apr. 13, 2017
Apr. 13, 2016
Related Party Transaction              
Interest income     $ 34 $ 20      
IPC | General Advisory And Management Services              
Related Party Transaction              
Specified amount of annual fees for ongoing advisory and management services     $ 500        
Annual fee for ongoing advisory and management services as a percentage of adjusted EBITDA     0.75%        
Amount incurred $ 300 $ 200 $ 900 700      
IPC | Amended PSA              
Related Party Transaction              
Fee payable upon consummation of qualified public offering or change of control 10,000   10,000        
Executive Officer | Promissory Note Agreement              
Related Party Transaction              
Interest income $ 13 $ 9 $ 34 $ 20      
Executive Officer | Promissory Note Agreement | Other Noncurrent Assets              
Related Party Transaction              
Note receivable         $ 600 $ 900 $ 1,000
Executive Officer | Promissory Note Agreement | Minimum              
Related Party Transaction              
Interest rate     1.45%        
Executive Officer | Promissory Note Agreement | Maximum              
Related Party Transaction              
Interest rate     2.72%