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Equity and Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Options Outstanding |  |  |  |
Number Outstanding | 696,665 |  |  |
Stock Options |  |  |  |
Options Outstanding |  |  |  |
Number Outstanding | 696,665 | 1,068,665 | 1,248,758 | 1,560,441
Remaining Contractual Life | 4 years 8 months 1 day |  |  |
Weighted Average Exercise Price Per Share | $ 7.00 | $ 7.04 | $ 7.69 | $ 7.95
Options Exercisable |  |  |  |
Number Exercisable | 611,542 | 842,083 | 1,014,300 |
Weighted Average Exercise Price Per Share | $ 7.19 | $ 7.45 | $ 7.93 |
Stock Options | 2.95-4.77 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 2.95 |  |  |
Range of Exercise Prices, Upper limit | $ 4.77 |  |  |
Number Outstanding | 83,500 |  |  |
Remaining Contractual Life | 5 years 3 days |  |  |
Weighted Average Exercise Price Per Share | $ 4.12 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 70,168 |  |  |
Weighted Average Exercise Price Per Share | $ 4.00 |  |  |
Stock Options | 4.85-5.07 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 4.85 |  |  |
Range of Exercise Prices, Upper limit | $ 5.07 |  |  |
Number Outstanding | 59,350 |  |  |
Remaining Contractual Life | 7 years 5 months 4 days |  |  |
Weighted Average Exercise Price Per Share | $ 4.95 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 53,100 |  |  |
Weighted Average Exercise Price Per Share | $ 4.93 |  |  |
Stock Options | 5.25-5.25 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 5.25 |  |  |
Range of Exercise Prices, Upper limit | $ 5.25 |  |  |
Number Outstanding | 85,912 |  |  |
Remaining Contractual Life | 4 years 9 months 21 days |  |  |
Weighted Average Exercise Price Per Share | $ 5.25 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 85,912 |  |  |
Weighted Average Exercise Price Per Share | $ 5.25 |  |  |
Stock Options | 5.40-5.40 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 5.40 |  |  |
Range of Exercise Prices, Upper limit | $ 5.40 |  |  |
Number Outstanding | 6,000 |  |  |
Remaining Contractual Life | 5 years 3 months 14 days |  |  |
Weighted Average Exercise Price Per Share | $ 5.40 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 6,000 |  |  |
Weighted Average Exercise Price Per Share | $ 5.40 |  |  |
Stock Options | 5.52-5.52 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 5.52 |  |  |
Range of Exercise Prices, Upper limit | $ 5.52 |  |  |
Number Outstanding | 100,000 |  |  |
Remaining Contractual Life | 6 years 9 months 18 days |  |  |
Weighted Average Exercise Price Per Share | $ 5.52 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 49,625 |  |  |
Weighted Average Exercise Price Per Share | $ 5.52 |  |  |
Stock Options | 5.75-6.60 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 5.75 |  |  |
Range of Exercise Prices, Upper limit | $ 6.60 |  |  |
Number Outstanding | 30,500 |  |  |
Remaining Contractual Life | 7 years 2 months 23 days |  |  |
Weighted Average Exercise Price Per Share | $ 5.99 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 22,000 |  |  |
Weighted Average Exercise Price Per Share | $ 5.75 |  |  |
Stock Options | 7.01-7.01 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 7.01 |  |  |
Range of Exercise Prices, Upper limit | $ 7.01 |  |  |
Number Outstanding | 70,000 |  |  |
Remaining Contractual Life | 3 years |  |  |
Weighted Average Exercise Price Per Share | $ 7.01 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 70,000 |  |  |
Weighted Average Exercise Price Per Share | $ 7.01 |  |  |
Stock Options | 7.40-7.98 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 7.40 |  |  |
Range of Exercise Prices, Upper limit | $ 7.98 |  |  |
Number Outstanding | 123,767 |  |  |
Remaining Contractual Life | 3 years 5 months 12 days |  |  |
Weighted Average Exercise Price Per Share | $ 7.76 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 117,101 |  |  |
Weighted Average Exercise Price Per Share | $ 7.78 |  |  |
Stock Options | 8.20-9.94 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 8.2 |  |  |
Range of Exercise Prices, Upper limit | $ 9.94 |  |  |
Number Outstanding | 17,935 |  |  |
Remaining Contractual Life | 1 year 7 months 17 days |  |  |
Weighted Average Exercise Price Per Share | $ 9.31 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 17,935 |  |  |
Weighted Average Exercise Price Per Share | $ 9.31 |  |  |
Stock Options | 9.98-22.26 |  |  |  |
Options Outstanding |  |  |  |
Range of Exercise Prices, Lower limit | 9.98 |  |  |
Range of Exercise Prices, Upper limit | $ 22.26 |  |  |
Number Outstanding | 119,701 |  |  |
Remaining Contractual Life | 3 years 2 months 15 days |  |  |
Weighted Average Exercise Price Per Share | $ 11.72 |  |  |
Options Exercisable |  |  |  |
Number Exercisable | 119,701 |  |  |
Weighted Average Exercise Price Per Share | $ 11.72 |  |  |

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