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Segment Information and Major Customers Geographic revenue (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2019 customer | Sep. 30, 2018 customer | Sep. 30, 2019 USD ($) customer | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) customer | Jun. 30, 2018 USD ($) | [1] | Mar. 31, 2018 USD ($) | [1] | Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2019 USD ($) customer | Sep. 30, 2018 USD ($) customer | Sep. 30, 2017 USD ($) customer
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ |  |  | $ 64,960 | $ 61,166 | $ 65,764 | $ 62,313 | $ 65,118 | [1] | $ 62,272 | $ 54,548 | $ 44,955 | $ 254,203 | $ 226,893 | [1] | $ 181,340 | [1]
Number of customer representing over ten percent of revenue |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Number of customer representing over ten percent of consolidated accounts receivable | 1 | 1 | 1 |  |  |  | 1 |  |  |  |  | 1 | 1 |  |  |
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration | 14.70% | 12.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | U.S. Export Net Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration |  |  |  |  |  |  |  |  |  |  |  | 28.50% | 30.10% |  | 37.20% |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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