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Business Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 176,426 | $ 164,516 | $ 120,308
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Operating loss | $ (8,848) | $ 2,936 | $ 65 | $ 7,766 | $ 8,034 | $ 3,971 | $ (1,400) | $ (180) | $ 1,919 | 10,425 | (7,908)
Capital expenditures |  |  |  |  |  |  |  |  | 1,495 | 1,256 | 978
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,854 | 2,493 | 2,974
Identifiable assets | 149,406 |  |  |  | 191,623 |  |  |  | 149,406 | 191,623 |
Solar |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 540 | 1,008 | 235
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,003 | 1,544 | 2,014
Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 352 | 236 | 692
Depreciation and amortization |  |  |  |  |  |  |  |  | 715 | 876 | 870
Polishing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 603 | 12 | 51
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 136 | 73 | 90
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] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 82,502 | 87,031 | 60,946
Operating loss |  |  |  |  |  |  |  |  | (7,050) | 6,060 | (6,696)
Identifiable assets | 48,898 |  |  |  | 97,999 |  |  |  | 48,898 | 97,999 |
Operating Segments | Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 80,163 | 67,237 | 50,637
Operating loss |  |  |  |  |  |  |  |  | 11,848 | 9,538 | 3,904
Identifiable assets | 59,744 |  |  |  | 57,177 |  |  |  | 59,744 | 57,177 |
Operating Segments | Polishing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 13,761 | 10,248 | 8,725
Operating loss |  |  |  |  |  |  |  |  | 3,672 | 2,617 | 1,588
Identifiable assets | 6,545 |  |  |  | 5,078 |  |  |  | 6,545 | 5,078 |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (6,551) | (7,790) | $ (6,704)
Identifiable assets | $ 34,219 |  |  |  | $ 31,369 |  |  |  | $ 34,219 | $ 31,369 |

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