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Equity and Stock-Based Compensation (Details) - USD ($) |  |  |  | 12 Months Ended | 84 Months Ended | 120 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2018 | Aug. 23, 2017 | Aug. 18, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 1996 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program period | 1 year |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount | $ 4,000,000 |  |  |  |  |  |  |  |  |
Repurchased amount of shares (in shares) |  |  |  | 771,149 |  |  |  |  |  |
Total cost of shares repurchased |  |  |  | $ 4,000,000 |  |  |  |  |  |
Average price per share of shares repurchased (dollars per share) |  |  |  | $ 5.19 |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 855,000 | $ 1,328,000 | $ 1,390,000 |  |  |  |
Compensation cost not yet recognized |  |  |  | $ 300,000 |  |  |  |  |  |
Shares available to grant (in shares) |  |  |  | 828,161 |  |  |  |  |  |
Option vesting period |  |  |  | 9 months 26 days |  |  |  |  |  |
2007 Employee Stock Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available to grant (in shares) |  |  |  | 739,561 |  |  |  |  |  |
2007 Employee Stock Incentive Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available to grant (in shares) |  |  |  |  |  |  |  |  |  | 500,000
Number of additional shares authorized (in shares) |  |  |  |  |  |  |  | 2,500,000 |  |
Non-Employee Directors Stock Option Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available to grant (in shares) |  |  |  | 88,600 |  |  |  |  |  |
Non-Employee Directors Stock Option Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized (in shares) |  |  |  |  |  |  |  |  | 400,000 |
Share-based compensation, shares issued (in shares) |  |  |  |  |  |  | 100,000 |  |  |
Minimum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  |  | 6 months |  |  |  |  |  |
Maximum | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |  |  |  |
Option vesting period |  |  |  | 4 years |  |  |  |  |  |
Offering |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 1,213,250 | 1,055,000 |  |  |  |  |  |  |
Sale of stock price per share (dollars per share) |  | $ 9.50 | $ 9.50 |  |  |  |  |  |  |
Proceeds from sale of stock |  | $ 10,600,000 |  |  |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  |  | 158,250 |  |  |  |  |  |  |

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