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Equity and Stock-based Compensation Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 29, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Share-based compensation expense |  | $ 200 | $ 200 | $ 363 | $ 463 |
Stock-based compensation expense |  | $ 108 |  |  |  |
Authorized stock repurchase amount | $ 4,000 |  |  |  |  |
Common stock, par value (USD per share) | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01
Stock repurchase program period | 1 year |  |  |  |  |
Shares repurchased (in shares) |  |  |  | 0 |  |
Stock Options |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Accelerated vesting of options (in shares) |  | 12,500 |  |  |  |
Options subject to modification (in shares) |  | 122,500 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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