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Business Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of business segments | segment |  |  | 3 |  |
Net revenues | $ 32,944 | $ 22,483 | $ 62,079 | $ 44,557 |
Operating income (loss) | (1,400) | (3,607) | (1,583) | (7,535) |
Identifiable assets | 135,038 |  | $ 135,038 |  | $ 118,430
Product Concentration Risk | Sales Revenue, Product Line | Semiconductor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk, percentage (less than) |  |  | 25.00% |  |
Operating Segments | Solar |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 16,555 | 9,801 | $ 27,979 | 19,344 |
Operating income (loss) | (1,878) | (2,266) | (2,901) | (4,130) |
Identifiable assets | 60,610 |  | 60,610 |  | 42,962
Operating Segments | Semiconductor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 13,443 | 10,507 | 29,146 | 21,206 |
Operating income (loss) | 1,403 | (119) | 3,763 | (279) |
Identifiable assets | 52,670 |  | 52,670 |  | 51,985
Operating Segments | Polishing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 2,946 | 2,175 | 4,954 | 4,007 |
Operating income (loss) | 503 | 386 | 967 | 555 |
Identifiable assets | 4,783 |  | 4,783 |  | 4,819
Non-Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (1,428) | $ (1,608) | (3,412) | $ (3,681) |
Identifiable assets | $ 16,975 |  | $ 16,975 |  | $ 18,664

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