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Stock-based Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Unrecognized compensation costs related to non-vested awards | $ 10,500,000 |  |  |  |
Weighted average period for recognition of compensation costs related to non-vested awards | 2 years 8 months 12 days |  |  |  |
Weighted average per share fair value of stock options | $ 14.38 | $ 18.30 |  |  |
Dividend yield | 0.00% | 0.00% |  |  |
Stock-based compensation | $ 1,393,000 | $ 1,231,000 |  |  |
Total pre-tax intrinsic value of options exercised | $ 200,000 | 100,000 |  |  |
Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance period start year | 2017 |  |  |  |
Performance period end year | 2019 |  |  |  |
Nonqualified Stock Options [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation | $ 600,000 | 500,000 |  |  |
Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
Nonqualified Stock Options [Member] | Minimum [Member] | Board of Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock option expiration term upon expiration of employment or service | 7 years |  |  |  |
Nonqualified Stock Options [Member] | Maximum [Member] | Board of Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period | 1 year |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation | $ 500,000 | $ 400,000 |  |  |
Number of stock units awarded | 54,694 | 42,248 |  |  |
Number of stock units forfeited | 4,099 | 507 |  |  |
Number of stock units outstanding | 99,500 |  |  | 90,409 |
Restricted Stock Awards [Member] | Minimum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period | 1 year |  |  |  |
Restricted Stock Awards [Member] | Maximum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Performance Shares [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Stock-based compensation |  | $ 200,000 |  |  |
Issuance of common stock, shares | 67,653 |  |  |  |
Issuance of common stock | $ 2,800,000 |  |  |  |
Performance Shares [Member] | Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Fair value of stock units granted |  |  | $ 1,200,000 |  |
1999 Employee Stock Purchase Plan [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Annual compensation withheld, maximum limit | 25,000 |  |  |  |
1999 Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation | $ 100,000 | 100,000 |  |  |
Common stock authorized, shares | 600,000 |  |  |  |
Annual compensation withheld | 10.00% |  |  |  |
Employee contributions | $ 100,000 |  |  | $ 100,000 |
Restricted Stock Units (RSUs) [Member] | 2009 Equity Incentive Plan [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation | $ 200,000 | $ 100,000 |  |  |
Number of stock units awarded | 8,032 | 6,206 |  |  |
Number of stock units outstanding | 62,113 |  |  | 62,242 |
Deferred Stock Units [Member] | 2009 Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation | $ 100,000 | $ 100,000 |  |  |
Number of stock units awarded | 823 | 751 |  |  |
Number of stock units outstanding | 30,552 |  |  |  | 29,729
Deferred Stock Units [Member] | Maximum [Member] | 2009 Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Fair value of stock units granted | $ 100,000 | $ 100,000 |  |  |
Vesting Anniversary [Member] | Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |

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