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Segment Information and Major Customers Geographic revenue (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
customer
Sep. 30, 2018
USD ($)
customer
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
customer
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
USD ($)
customer
Sep. 30, 2017
USD ($)
customer
Sep. 30, 2016
USD ($)
customer
Segment Reporting Information [Line Items]                        
Revenues   $ 65,662 $ 62,716 $ 54,791 $ 45,197 $ 45,105 $ 45,739 $ 45,615 $ 45,175 $ 228,366 $ 181,634 $ 203,005
Number of customer representing over ten percent of revenue | customer                   0 0 0
Number of customer representing over ten percent of consolidated accounts receivable | customer 1 1       0       1 0  
Accounts Receivable                        
Segment Reporting Information [Line Items]                        
Percentage of concentration 12.00%                      
North America, primarily United States                        
Segment Reporting Information [Line Items]                        
Revenues                   $ 163,397 $ 117,749 $ 131,457
United States | U.S. Export Net Sales                        
Segment Reporting Information [Line Items]                        
Percentage of concentration                   29.90% 37.10% 38.70%
Europe, Middle East and Africa                        
Segment Reporting Information [Line Items]                        
Revenues                   $ 39,211 $ 39,403 $ 44,932
Asia                        
Segment Reporting Information [Line Items]                        
Revenues                   20,881 19,892 20,390
Latin America                        
Segment Reporting Information [Line Items]                        
Revenues                   $ 4,877 $ 4,590 $ 6,226