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Stock-Based Compensation (Stock Options Outstanding) (Details) - Stock Options - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 1,627,477 | 1,063,324 |  | 1,059,567 | 891,293
Remaining Contractual Life (in years) | 6 years 25 days |  |  |  |
Average Exercise Price | $ 9.11 | $ 7.37 | $ 7.37 | $ 6.71 | $ 9.37
Aggregate Intrinsic Value | $ 238,000 |  |  |  |
Number Outstanding - Vested and expected to vest | 1,624,545 |  |  |  |
Remaining Contractual Life - Vested and expected to vest | 6 years 25 days |  |  |  |
Average Exercise Price - Vested and expected to vest | $ 9.11 |  |  |  |
Aggregate Intrinsic Value - Vested and expected to vest | $ 238,000 |  |  |  |
Exercisable at end of period (in shares) | 1,002,421 |  | 674,237 | 874,591 |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 9.74 |  | $ 8.18 | $ 7.13 |
Aggregate intrinsic value | $ 149,629 |  |  |  |
2.95-3.30 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 165,310 |  |  |  |
Remaining Contractual Life (in years) | 7 years 1 month |  |  |  |
Average Exercise Price | $ 2.96 |  |  |  |
Exercisable at end of period (in shares) | 99,968 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 2.97 |  |  |  |
2.95-3.30 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 3.30 |  |  |  |
2.95-3.30 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 2.95 |  |  |  |
3.80-7.00 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 143,402 |  |  |  |
Remaining Contractual Life (in years) | 3 years 5 months 10 days |  |  |  |
Average Exercise Price | $ 5.69 |  |  |  |
Exercisable at end of period (in shares) | 143,402 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 5.69 |  |  |  |
3.80-7.00 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 7 |  |  |  |
3.80-7.00 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 3.80 |  |  |  |
7.01-7.14 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 269,106 |  |  |  |
Remaining Contractual Life (in years) | 8 years 2 months 27 days |  |  |  |
Average Exercise Price | $ 7.01 |  |  |  |
Exercisable at end of period (in shares) | 81,327 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 7.01 |  |  |  |
7.01-7.14 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 7.14 |  |  |  |
7.01-7.14 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 7.01 |  |  |  |
7.15-7.87 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 60,223 |  |  |  |
Remaining Contractual Life (in years) | 5 years 6 months 10 days |  |  |  |
Average Exercise Price | $ 7.60 |  |  |  |
Exercisable at end of period (in shares) | 23,144 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 7.15 |  |  |  |
7.15-7.87 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 7.87 |  |  |  |
7.15-7.87 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 7.15 |  |  |  |
7.88-8.00 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 246,806 |  |  |  |
Remaining Contractual Life (in years) | 6 years 2 months 27 days |  |  |  |
Average Exercise Price | $ 7.98 |  |  |  |
Exercisable at end of period (in shares) | 246,806 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 7.98 |  |  |  |
7.88-8.00 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 8.00 |  |  |  |
7.88-8.00 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 7.88 |  |  |  |
8.01-9.94 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 99,338 |  |  |  |
Remaining Contractual Life (in years) | 6 years 5 months |  |  |  |
Average Exercise Price | $ 8.93 |  |  |  |
Exercisable at end of period (in shares) | 43,566 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 9.42 |  |  |  |
8.01-9.94 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 9.94 |  |  |  |
8.01-9.94 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 8.01 |  |  |  |
9.95-10.49 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 282,500 |  |  |  |
Remaining Contractual Life (in years) | 9 years 27 days |  |  |  |
Average Exercise Price | $ 9.98 |  |  |  |
Exercisable at end of period (in shares) | 6,000 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 9.98 |  |  |  |
9.95-10.49 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 10.49 |  |  |  |
9.95-10.49 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 9.95 |  |  |  |
10.50-15.23 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 184,041 |  |  |  |
Remaining Contractual Life (in years) | 2 years 8 months |  |  |  |
Average Exercise Price | $ 11.80 |  |  |  |
Exercisable at end of period (in shares) | 181,457 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 11.81 |  |  |  |
10.50-15.23 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 15,230.00 |  |  |  |
10.50-15.23 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 10,500.00 |  |  |  |
15.24-22.26 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 161,489 |  |  |  |
Remaining Contractual Life (in years) | 3 years 25 days |  |  |  |
Average Exercise Price | $ 18.00 |  |  |  |
Exercisable at end of period (in shares) | 161,489 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 18.00 |  |  |  |
15.24-22.26 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 22.26 |  |  |  |
15.24-22.26 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 15.24 |  |  |  |
27.47-25.00 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number Outstanding | 15,262 |  |  |  |
Remaining Contractual Life (in years) | 2 years 6 months |  |  |  |
Average Exercise Price | $ 27.47 |  |  |  |
Exercisable at end of period (in shares) | 15,262 |  |  |  |
Exercisable at end of period, weighted average exercise price (usd per share) | $ 27.47 |  |  |  |
27.47-25.00 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | 25.00 |  |  |  |
27.47-25.00 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average Exercise Price | $ 27.47 |  |  |  |

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