Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Stock Options Outstanding and Exercisable) (Details)

v3.5.0.2
Stock-Based Compensation (Stock Options Outstanding and Exercisable) (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 1,841,567 1,627,477 1,063,324 1,059,567
Options Outstanding, Remaining Contractual Life 6 years 2 months 16 days      
Options Outstanding, Average Exercise Price (usd per share) $ 8.15 $ 9.11 $ 7.37 $ 6.71
Options Outstanding, Aggregate Intrinsic Value $ 342      
Options Outstanding, Number Outstanding, Vested and Expected to Vest (in shares) 1,838,990      
Options Outstanding, Remaining Contractual Life, Vested and Expected to Vest (usd per share) 6 years 2 months 16 days      
Options Outstanding, Average Exercise Price, Vested and Expected to Vest (usd per share) $ 8.15      
Options Outstanding, Aggregate Intrinsic Value, Vested and expected to vest $ 342      
Options Exercisable, Number Exercisable (in shares) 1,127,611 1,002,421 674,237  
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 8.92 $ 9.74 $ 8.18  
Options Exercisable, Aggregate Intrinsic Value $ 280      
2.95-4.85        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 192,954      
Options Outstanding, Remaining Contractual Life 5 years 8 months 9 days      
Options Outstanding, Average Exercise Price (usd per share) $ 3.19      
Options Exercisable, Number Exercisable (in shares) 152,595      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 3.12      
2.95-4.85 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 2.95      
2.95-4.85 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 4.85      
5.01-5.20        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 5,010      
Options Outstanding, Remaining Contractual Life 2 years 9 months 11 days      
Options Outstanding, Average Exercise Price (usd per share) $ 5.05      
Options Exercisable, Number Exercisable (in shares) 5,010      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 5.05      
5.01-5.20 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 5.01      
5.01-5.20 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 5.20      
5.25-5.25        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 337,600      
Options Outstanding, Remaining Contractual Life 9 years 1 month 17 days      
Options Outstanding, Average Exercise Price (usd per share) $ 5.25      
Options Exercisable, Number Exercisable (in shares) 24,000      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 5.25      
5.25-5.25 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 5.25      
5.25-5.25 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 5.25      
5.40-7.00        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 107,261      
Options Outstanding, Remaining Contractual Life 2 years 10 months 6 days      
Options Outstanding, Average Exercise Price (usd per share) $ 6.26      
Options Exercisable, Number Exercisable (in shares) 107,261      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 6.26      
5.40-7.00 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 5.40      
5.40-7.00 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 7.00      
7.01-7.01        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 266,106      
Options Outstanding, Remaining Contractual Life 7 years 2 months 12 days      
Options Outstanding, Average Exercise Price (usd per share) $ 7.01      
Options Exercisable, Number Exercisable (in shares) 157,654      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 7.01      
7.01-7.01 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 7.01      
7.01-7.01 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 7.01      
7.15-7.87        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 54,390      
Options Outstanding, Remaining Contractual Life 4 years 6 months 11 days      
Options Outstanding, Average Exercise Price (usd per share) $ 7.59      
Options Exercisable, Number Exercisable (in shares) 32,342      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 7.40      
7.15-7.87 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 7.15      
7.15-7.87 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 7.87      
7.98-7.98        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 239,873      
Options Outstanding, Remaining Contractual Life 5 years 2 months 16 days      
Options Outstanding, Average Exercise Price (usd per share) $ 7.98      
Options Exercisable, Number Exercisable (in shares) 239,873      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 7.98      
7.98-7.98 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 7.98      
7.98-7.98 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 7.98      
8.20-9.94        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 91,888      
Options Outstanding, Remaining Contractual Life 5 years 8 months 19 days      
Options Outstanding, Average Exercise Price (usd per share) $ 8.87      
Options Exercisable, Number Exercisable (in shares) 60,638      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 9.21      
8.20-9.94 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 8,200.00      
8.20-9.94 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 9,940.00      
9.98-9.98        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 281,750      
Options Outstanding, Remaining Contractual Life 8 years 1 month 21 days      
Options Outstanding, Average Exercise Price (usd per share) $ 9.98      
Options Exercisable, Number Exercisable (in shares) 87,503      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 9.98      
9.98-9.98 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 9.98      
9.98-9.98 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 9.98      
10.50-27.47        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number Outstanding (in shares) 264,735      
Options Outstanding, Remaining Contractual Life 2 years 8 months 12 days      
Options Outstanding, Average Exercise Price (usd per share) $ 15.52      
Options Exercisable, Number Exercisable (in shares) 260,735      
Options Exercisable, Weighted Average Exercise Price (usd per share) $ 15.60      
10.50-27.47 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) 10.50      
10.50-27.47 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Average Exercise Price (usd per share) $ 27.47