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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Number of Shares      
Outstanding at beginning of period (in shares) 2,324 2,380  
Granted (in shares) 25    
Cancelled (in shares) (123) (56)  
Outstanding at end of period (in shares) 2,226 2,324 2,380
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 1.40 $ 1.40  
Granted (in dollars per share) 2.80    
Cancelled (in dollars per share) 1.40 1.40  
Outstanding at end of period (in dollars per share) $ 1.43 $ 1.40 $ 1.40
Share Based Compensation Arrangement by Share Based Payment, Award, Options Weighted Average Remaining Contractual Term [Abstract]      
Outstanding 5 years 9 months 8 days 6 years 9 months 22 days 7 years 10 months
Share Based Compensation Arrangement by Share Based Payment, Award, Options Aggregate Intrinsic Value [Abstract]      
Outstanding at the end of period (in dollars) $ 7,581 $ 3,649 $ 1,589