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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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | $ 8,761 |  | $ 8,761 |  | $ 10,140 | $ 0
Inventories, net | 10,342 |  | 10,342 |  | 11,727 | 18,269
Contract liabilities (included within accrued liabilities) | 0 |  | 0 |  |  | 0
Deferred income taxes | 2,193 |  | 2,193 |  |  | 2,413
Retained earnings | 38,114 |  | 38,114 |  | 40,695 | 37,097
Income Statement [Abstract] |  |  |  |  |  |
Net sales | 27,392 | $ 27,794 | 56,458 | $ 52,044 |  |
Cost of goods sold | 25,304 | 25,265 | 51,633 | 47,487 |  |
Loss before income tax expense (benefit) | (1,224) | (2,035) | (3,020) | (3,186) |  |
Net loss | $ (1,258) | $ (2,038) | $ (2,540) | $ (2,949) |  |
Basic net loss per share (in dollars per share) | $ (0.23) | $ (0.37) | $ (0.46) | $ (0.53) |  |
Diluted net loss per share (in dollars per share) | $ (0.23) | $ (0.37) | $ (0.46) | $ (0.53) |  |
Income tax expense (benefit) | $ 34 | $ 3 | $ (480) | $ (237) |  |
Previous Accounting Method |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | 0 |  | 0 |  |  | 0
Inventories, net | 14,931 |  | 14,931 |  |  | 18,269
Contract liabilities (included within accrued liabilities) | 0 |  | 0 |  |  |
Deferred income taxes | 2,193 |  | 2,193 |  |  |
Retained earnings | 33,942 |  | 33,942 |  |  | $ 37,097
Income Statement [Abstract] |  |  |  |  |  |
Net sales | 29,452 |  | 57,838 |  |  |
Cost of goods sold | 27,622 |  | 53,586 |  |  |
Loss before income tax expense (benefit) | (1,482) |  | (3,593) |  |  |
Net loss | $ (1,516) |  | $ (3,113) |  |  |
Basic net loss per share (in dollars per share) | $ (0.27) |  | $ (0.56) |  |  |
Diluted net loss per share (in dollars per share) | $ (0.27) |  | $ (0.56) |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Cost of goods sold |  |  | $ (333) |  |  |
Accounting Standards Update 2014-09 | Effect of Accounting Change |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Contract asset | $ 8,761 |  | 8,761 |  | 10,140 |
Inventories, net | (4,589) |  | (4,589) |  | (6,542) |
Contract liabilities (included within accrued liabilities) | 0 |  | 0 |  |  |
Deferred income taxes | 0 |  | 0 |  |  |
Retained earnings | 4,172 |  | 4,172 |  | $ 3,598 |
Income Statement [Abstract] |  |  |  |  |  |
Net sales | (2,060) |  | (1,380) |  |  |
Cost of goods sold | (2,318) |  | (1,953) |  |  |
Loss before income tax expense (benefit) | 258 |  | 573 |  |  |
Net loss | $ 258 |  | $ 573 |  |  |
Basic net loss per share (in dollars per share) | $ 0.04 |  | $ 0.10 |  |  |
Diluted net loss per share (in dollars per share) | $ 0.04 |  | $ 0.10 |  |  |

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