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Summary of Significant Accounting Policies - Effects of Adoption of 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Oct. 01, 2018 | Sep. 30, 2018
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | $ 8,910 |  | $ 8,910 |  | $ 10,140 | $ 0
Inventories, net | 11,944 |  | 11,944 |  | 11,727 | 18,269
Contract liabilities (included within accrued liabilities) | 1,000 |  | 1,000 |  |  | 0
Deferred income taxes | 2,112 |  | 2,112 |  |  | 2,413
Retained earnings | 30,743 |  | 30,743 |  | 40,695 | 37,097
Income Statement [Abstract] |  |  |  |  |  |
Net sales | 24,873 | $ 28,681 | 81,331 | $ 80,726 |  |
Cost of goods sold | 23,486 | 25,402 | 75,119 | 72,889 |  |
Loss before income tax benefit | (7,706) | (1,750) | (10,727) | (4,937) |  |
Net loss | $ (7,370) | $ (1,532) | $ (9,911) | $ (4,481) |  |
Basic net loss per share (in dollars per share) | $ (1.32) | $ (0.28) | $ (1.78) | $ (0.81) |  |
Diluted net loss per share (in dollars per share) | $ (1.32) | $ (0.28) | $ (1.78) | $ (0.81) |  |
Income tax benefit | $ (336) | $ (218) | $ (816) | $ (456) |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Cost of goods sold |  |  | (210) |  |  |
Previous Accounting Method |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | 0 |  | 0 |  |  | 0
Inventories, net | 17,170 |  | 17,170 |  |  | 18,269
Contract liabilities (included within accrued liabilities) | 1,000 |  | 1,000 |  |  |
Deferred income taxes | 2,112 |  | 2,112 |  |  |
Retained earnings | 27,059 |  | 27,059 |  |  | $ 37,097
Income Statement [Abstract] |  |  |  |  |  |
Net sales | 24,723 |  | 82,561 |  |  |
Cost of goods sold | 22,849 |  | 76,435 |  |  |
Loss before income tax benefit | (7,219) |  | (10,813) |  |  |
Net loss | $ (6,883) |  | $ (9,997) |  |  |
Basic net loss per share (in dollars per share) | $ (1.23) |  | $ (1.80) |  |  |
Diluted net loss per share (in dollars per share) | $ (1.23) |  | $ (1.80) |  |  |
Effect of Accounting Change | Accounting Standards Update 2014-09 |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | $ 8,910 |  | $ 8,910 |  | 10,140 |
Inventories, net | (5,226) |  | (5,226) |  | (6,542) |
Contract liabilities (included within accrued liabilities) | 0 |  | 0 |  |  |
Deferred income taxes | 0 |  | 0 |  |  |
Retained earnings | 3,684 |  | 3,684 |  | $ 3,598 |
Income Statement [Abstract] |  |  |  |  |  |
Net sales | 150 |  | (1,230) |  |  |
Cost of goods sold | 637 |  | (1,316) |  |  |
Loss before income tax benefit | (487) |  | 86 |  |  |
Net loss | $ (487) |  | $ 86 |  |  |
Basic net loss per share (in dollars per share) | $ (0.09) |  | $ 0.02 |  |  |
Diluted net loss per share (in dollars per share) | $ (0.09) |  | $ 0.02 |  |  |

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