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Debt - 2017 Facility - Additional Information (Details) - 2017 Credit Facility
$ in Millions
May 04, 2017
USD ($)
payment
Jun. 30, 2018
Dec. 31, 2017
payment
Debt      
Loan agreement amount | $ $ 12.0    
Number of interest and principal payments     24
End-of-term fee (as a percent) 6.00%    
Minimum      
Debt      
Number of interest and principal payments 24    
Maximum      
Debt      
Number of interest and principal payments 36    
Prime Rate      
Debt      
Interest rate, negative basis spread percentage 0.75%    
Interest rate   4.25%