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Summary of Significant Accounting Policies - Effects of Adoption of 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Oct. 01, 2018
Statement of Financial Position [Abstract] |  |  |
Contract asset | $ 10,349 | $ 0 | $ 10,140
Inventories, net | 10,509 | 18,269 | 11,727
Contract liabilities (included within accrued liabilities) | 382 |  | 0
Deferred income taxes | 1,718 | 2,413 |
Retained earnings | 33,148 | 37,097 | 40,695
Income Statement [Abstract] |  |  |
Net sales | 112,454 | 111,212 |
Cost of goods sold | 101,817 | 101,110 |
Net loss | $ (7,506) | $ (7,170) |
Net Loss per share (basic and diluted) (in dollars per share) | $ (1.35) | $ (1.30) |
Accounting Standards Update 2014-09 |  |  |
Income Statement [Abstract] |  |  |
Cost of goods sold | $ (340) |  |
Previous Accounting Method |  |  |
Statement of Financial Position [Abstract] |  |  |
Contract asset | 0 | $ 0 |
Inventories, net | 16,592 | 18,269 |
Contract liabilities (included within accrued liabilities) | 537 |  |
Deferred income taxes | 1,718 |  |
Retained earnings | 28,727 | $ 37,097 |
Income Statement [Abstract] |  |  |
Net sales | 112,090 |  |
Cost of goods sold | 102,276 |  |
Net loss | $ (8,329) |  |
Net Loss per share (basic and diluted) (in dollars per share) | $ (1.50) |  |
Effect of Accounting Changes | Accounting Standards Update 2014-09 |  |  |
Statement of Financial Position [Abstract] |  |  |
Contract asset | $ 10,349 |  | 10,140
Inventories, net | (6,083) |  | (6,542)
Contract liabilities (included within accrued liabilities) | (155) |  |
Deferred income taxes | 0 |  |
Retained earnings | 4,421 |  | $ 3,598
Income Statement [Abstract] |  |  |
Net sales | 364 |  |
Cost of goods sold | (459) |  |
Net loss | $ 823 |  |
Net Loss per share (basic and diluted) (in dollars per share) | $ 0.15 |  |

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