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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Loss Contingencies [Line Items]        
Total rent expense $ 1.3 $ 1.0 $ 3.8 $ 2.9
Minimum        
Loss Contingencies [Line Items]        
Lease expiration year     2018  
Maximum        
Loss Contingencies [Line Items]        
Lease expiration year     2027