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Business Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Net revenue | $ 54,677 | $ 47,760 | $ 32,944 | $ 29,135 | $ 42,409 | $ 33,342 | $ 22,483 | $ 22,074 | $ 164,516 | $ 120,308 | $ 104,883
Operating loss |  |  |  |  |  |  |  |  | 10,425 | (7,908) | (13,521)
Capital expenditures |  |  |  |  |  |  |  |  | 1,256 | 978 | 610
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,493 | 2,974 | 3,357
Identifiable assets | 191,623 |  |  |  | 118,430 |  |  |  | 191,623 | 118,430 |
Solar |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 1,008 | 235 | 411
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,544 | 2,014 | 2,940
Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 236 | 692 | 136
Depreciation and amortization |  |  |  |  |  |  |  |  | 876 | 870 | 318
Polishing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 12 | 51 | 63
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 73 | 90 | 99
Product Concentration Risk | Sales Revenue, Product Line | Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 25.00% |  |
Operating Segments | Solar |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 87,031 | 60,946 | 56,689
Operating loss |  |  |  |  |  |  |  |  | 6,060 | (6,696) | (5,056)
Identifiable assets | 97,999 |  |  |  | 42,962 |  |  |  | 97,999 | 42,962 |
Operating Segments | Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 67,237 | 50,637 | 37,250
Operating loss |  |  |  |  |  |  |  |  | 9,538 | 3,904 | (1,268)
Identifiable assets | 57,177 |  |  |  | 51,985 |  |  |  | 57,177 | 51,985 |
Operating Segments | Polishing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 10,248 | 8,725 | 10,944
Operating loss |  |  |  |  |  |  |  |  | 2,617 | 1,588 | 2,250
Identifiable assets | 5,078 |  |  |  | 4,819 |  |  |  | 5,078 | 4,819 |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (7,790) | (6,704) | $ (9,447)
Identifiable assets | $ 31,369 |  |  |  | $ 18,664 |  |  |  | $ 31,369 | $ 18,664 |

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