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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Effect on income before income taxes $ (366)   $ (336) $ (708) $ (568)
Effect on income taxes 51   58 98 95
Effect on net income $ (315)   $ (278) $ (610) $ (473)
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Beginning Outstanding (in shares)   13,540   13,540 35,203
Released (in shares)       (13,540) (21,663)
Ending Outstanding (in shares) 0   13,540 0 13,540
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Beginning Outstanding, Weighted Average Grant Date Fair Value (usd per share)   $ 7.98   $ 7.98 $ 10.13
Released, Weighted Average Grant Date Fair Value (usd per share)       7.98 11.47
Ending Outstanding, Weighted Average Grant Date Fair Value (usd per share) $ 0.00   $ 7.98 $ 0.00 $ 7.98
Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period (in years)       4 years  
Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period (in years)       2 years  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Outstanding at beginning of period (in shares)   1,627,477   1,627,477 1,063,324
Granted (in shares)       350,075 327,500
Assumed - Merger (in shares)       0 367,229
Exercised (in shares)       (9,188) (11,289)
Forfeited (in shares)       (62,116) (641)
Outstanding at end of period (in shares) 1,906,248   1,746,123 1,906,248 1,746,123
Exercisable at end of period (in shares) 1,170,018   1,102,682 1,170,018 1,102,682
Weighted average fair value of options granted during the period (usd per share)       $ 3.04 $ 5.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]          
Outstanding at beginning of period, Weighted Average Exercise Price (usd per share)   $ 9.11   9.11 7.37
Granted, Weighted Average Exercise Price (usd per share)       5.25 9.74
Assumed - merger, Weighted Average Exercise Price (usd per share)       0.00 14.19
Exercised, Weighted Average Exercise Price (usd per share)       3.27 4.91
Forfeited, Weighted Average Exercise Price (usd per share)       13.87 9.08
Outstanding at end of period, Weighted Average Exercise Price (usd per share) $ 8.29   $ 9.26 8.29 9.26
Exercisable at end of period, Weighted Average Exercise Price (usd per share) $ 9.16   $ 9.90 $ 9.16 $ 9.90
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Risk free interest rate       2.00% 2.00%
Expected life       6 years 6 years
Dividend rate       0.00% 0.00%
Volatility       63.00% 67.00%
Stock Options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option expiration period (in years)   10 years      
Option vesting period (in years)       4 years  
Stock Options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period (in years)       6 months