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STOCK-BASED COMPENSATION - Stock option activity (Details) - Employee Stock Option [Member]
9 Months Ended
Jun. 30, 2019
$ / shares
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Options (shares) Outstanding | shares 301
Options (shares) Exercised | shares (7)
Options (shares) Granted | shares 483
Options (shares) Forfeited | shares (4)
Options (shares) Outstanding | shares 773
Weighted-Average Exercise Price Outstanding $ 1.73
Weighted-Average Exercise Price Exercised 1.13
Weighted-Average Exercise Price Granted 1.50
Weighted-Average Exercise Price Forfeited 1.75
Weighted-Average Exercise Price Outstanding 1.59
Weighted-Average Grant Date Fair Value Outstanding 1.38
Weighted-Average Grant Date Fair Value Exercised 0.94
Weighted-Average Grant Date Fair Value Granted 1.10
Weighted-Average Grant Date Fair Value Forfeited 1.39
Weighted-Average Grant Date Fair Value Outstanding $ 1.21