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Line of Credit (Details)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2017
USD ($)
Line Of Credit Facility [Line Items]        
Revolving line of credit, maximum borrowing capacity   $ 20.0    
Adjusted quick ratio   1.25    
Line of Credit Facility, Remaining Borrowing Capacity       $ 15.5
Revolving line of credit amount outstanding   $ 0.0 $ 0.0  
Prime rate        
Line Of Credit Facility [Line Items]        
Revolving line of credit, basis spread over variable rate   5.00%    
Revolving line of credit        
Line Of Credit Facility [Line Items]        
Bank guarantee to customer       $ 3.0
Letter of credit        
Line Of Credit Facility [Line Items]        
Amount drawn from revolving line of credit $ 1.5