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Stockholders' Equity - Warrants Outstanding (Details) - Warrants - $ / shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Warrants        
Beginning balance (in shares) 12,439,387 23,029 44,587  
Granted (in shares)   12,437,916    
Exercised (in shares) (1,489)      
Forfeited or expired (in shares) (1,471) (21,558) (21,558)  
Ending balance (in shares) 12,436,427 12,439,387 23,029 44,587
Weighted Average Exercise Price Per Share        
Beginning balance (in dollars per share) $ 3.25 $ 5.00 $ 5.00  
Exercised (in dollars per share) 3.25      
Granted (in dollars per share)   3.25    
Forfeited or expired (in dollars per share) 5.00 5.00 5.00  
Ending balance (in dollars per share) $ 3.25 $ 3.25 $ 5.00 $ 5.00
Weighted Average Remaining Contractual Term        
Balance outstanding 3 years 3 months 18 days 4 years 3 months 18 days 9 months 1 year 3 months 4 days
Issued   4 years 3 months 18 days