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Segment Information and Major Customers Geographic revenue (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 customer | Sep. 30, 2017 USD ($) customer | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) customer | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) customer | Sep. 30, 2016 USD ($) customer | Sep. 30, 2015 USD ($) customer
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 45,105 | $ 45,739 | $ 45,615 | $ 45,175 | $ 50,454 | $ 52,130 | $ 50,162 | $ 50,259 | $ 181,634 | $ 203,005 | $ 203,847
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 | 2 | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 2
North America, primarily United States |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 117,749 | $ 131,457 | $ 127,592
United States | U.S. Export Net Sales |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration |  |  |  |  |  |  |  |  |  | 37.10% | 38.70% | 39.40%
United States | Accounts Receivable | Customer 1 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration | 10.70% |  |  |  |  |  |  |  |  |  |  |
United States | Accounts Receivable | Customer 2 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration | 11.60% |  |  |  |  |  |  |  |  |  |  |
Europe, Middle East and Africa |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 39,403 | $ 44,932 | $ 47,523
Asia |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 19,892 | 20,390 | 22,907
Latin America |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 4,590 | $ 6,226 | $ 5,825

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