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Equity (Schedule of Restricted Stock Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 10, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares authorized (in shares)   50,000,000 50,000,000  
Preferred stock, shares authorized (in shares)   5,882,000 5,882,000  
Preferred stock, par value (in usd per share)   $ 0.0001 $ 0.0001  
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)   398,000 508,000 1,391,000
Common stock, shares issued (in shares)   33,938,000 33,154,000  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining unamortized stock-based compensation expense   $ 0.1    
Number of Shares        
Non-vested, beginning balance (in shares)   0    
Granted (in shares)   8,154    
Vested (in shares)   0    
Canceled (in shares)   0    
Forfeited (in shares)   0    
Non-vested, ending balance (in shares)   8,154 0  
Weighted Average Grant Date Fair Value        
Non-vested, beginning balance (in usd per share)   $ 0.00    
Granted (in usd per share)   8.20    
Vested (in usd per share)   0.00    
Canceled (in usd per share)   0.00    
Forfeited (in usd per share)   0.00    
Non-vested, ending balance (in usd per share)   $ 8.20 $ 0.00  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining unamortized stock-based compensation expense   $ 3.4    
Number of Shares        
Non-vested, beginning balance (in shares)   878,416    
Granted (in shares)   307,509    
Vested (in shares) (300,000) (357,013)    
Canceled (in shares)   (8,154)    
Forfeited (in shares)   (42,674)    
Non-vested, ending balance (in shares)   778,084 878,416  
Weighted Average Grant Date Fair Value        
Non-vested, beginning balance (in usd per share)   $ 4.25    
Granted (in usd per share)   8.44 $ 5.53 $ 5.38
Vested (in usd per share)   4.15    
Canceled (in usd per share)   5.50    
Forfeited (in usd per share)   4.66    
Non-vested, ending balance (in usd per share)   $ 5.91 $ 4.25