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Commitments and Contingencies - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Loss Contingencies [Line Items]        
Rent expense $ 900,000 $ 800,000 $ 2,600,000 $ 1,700,000
Revolving Credit Facility | Secured Debt        
Loss Contingencies [Line Items]        
Line of credit drawn amount 0   0  
Revolving Credit Facility | Secured Debt | Western Alliance Bank        
Loss Contingencies [Line Items]        
Line of credit facility $ 15,000,000   $ 15,000,000  
Line of credit facility, expiration date Sep. 28, 2018   Sep. 30, 2018