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Certain Relationships and Related Party Transactions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Majority Shareholder      
Related Party Transaction [Line Items]      
Related party transaction, revenues from transactions with related party $ 4.9 $ 4.4 $ 3.6
Receivables due from BGP $ 1.6 0.6  
Company's outstanding common stock owned by related parties 10.60%    
Board of Directors Chairman      
Related Party Transaction [Line Items]      
Company's outstanding common stock owned by related parties 8.80%    
Payments for continued services agreement (less than)     $ 0.1
Area of office space subleased (sqft) | ft² 4,100    
Board of Directors Chairman | Manufacturing facility      
Related Party Transaction [Line Items]      
Payments for continued services agreement (less than) $ 0.4 $ 0.2