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STOCK-BASED COMPENSATION - Stock option activity (Details) - Employee Stock Option [Member] - $ / shares
shares in Thousands
9 Months Ended
Jun. 30, 2020
STOCK-BASED COMPENSATION  
Options (shares) Outstanding 776
Options (shares) Exercised (118)
Options (shares) Granted 138
Options (shares) Forfeited (45)
Options (shares) Outstanding 751
Options (shares) Exercisable 314
Weighted-Average Exercise Price Outstanding $ 1.61
Weighted-Average Exercise Price Exercised 1.60
Weighted-Average Exercise Price Granted 4.51
Weighted-Average Exercise Price Forfeited 1.62
Weighted-Average Exercise Price Outstanding 2.14
Weighted-Average Grant Date Fair Value Outstanding 1.22
Weighted-Average Grant Date Fair Value Exercised 1.26
Weighted-Average Grant Date Fair Value Granted 3.07
Weighted-Average Grant Date Fair Value Forfeited 1.23
Weighted-Average Grant Date Fair Value Outstanding $ 1.55