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Business Segment Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of business segments | segment | 3 |  |
Net revenues | $ 29,135 | $ 22,074 |
Operating income (Loss) | (180) | (3,929) |
Identifiable assets | $ 115,918 |  | $ 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 | $ 11,424 | 9,543 |
Operating income (Loss) | (1,023) | (1,864) |
Identifiable assets | 43,334 |  | 42,962
Operating Segments | Semiconductor |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 15,703 | 10,700 |
Operating income (Loss) | 2,361 | (160) |
Identifiable assets | 51,898 |  | 51,985
Operating Segments | Polishing |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 2,008 | 1,831 |
Operating income (Loss) | 464 | 169 |
Identifiable assets | 4,906 |  | 4,819
Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (Loss) | (1,982) | $ (2,074) |
Identifiable assets | $ 15,780 |  | $ 18,664

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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