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Line of Credit (Details)
$ in Millions
1 Months Ended 9 Months Ended
May 31, 2015
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line Of Credit Facility [Line Items]      
Revolving line of credit, maximum borrowing capacity   $ 20.0  
Quick ratio   1.25  
Revolving line of credit amount outstanding   $ 0.0 $ 0.0
Line of Credit Facility, Remaining Borrowing Capacity $ 18.5    
Prime Rate      
Line Of Credit Facility [Line Items]      
Revolving line of credit, basis spread over variable rate   5.00%  
Letter of Credit [Member]      
Line Of Credit Facility [Line Items]      
Amount drawn from revolving line of credit $ 1.5