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Business Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Business Segment Information        
Number of Reportable Segments | segment     1  
Total net sales $ 58,509 $ 43,908 $ 171,135 $ 127,202
United States        
Business Segment Information        
Total net sales 47,588 36,413 139,893 106,337
International        
Business Segment Information        
Total net sales $ 10,921 $ 7,495 $ 31,242 $ 20,865