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Business Segment and Geographic Area Information - Geographic Area Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales $ 28,828 $ 20,917 $ 77,627 $ 61,647
Long-Lived Assets 6,774 6,464 6,774 6,464
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales 27,353 19,564 75,051 57,507
Canada [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales 503 247 729 878
Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales 765 921 1,443 1,870
Middle East [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales 0 0 0 3
Rest of the World [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Sales $ 207 $ 185 $ 404 $ 1,389