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STOCK-BASED COMPENSATION - Stock option activity (Details) - Employee Stock Option [Member] - $ / shares
shares in Thousands
6 Months Ended
Mar. 31, 2020
STOCK-BASED COMPENSATION  
Options (shares) Outstanding 776
Options (shares) Exercised (42)
Options (shares) Granted 73
Options (shares) Forfeited (5)
Options (shares) Outstanding 802
Options (shares) Exercisable 336
Weighted-Average Exercise Price Outstanding $ 1.61
Weighted-Average Exercise Price Exercised 1.71
Weighted-Average Exercise Price Granted 4.73
Weighted-Average Exercise Price Forfeited 1.63
Weighted-Average Exercise Price Outstanding 1.89
Weighted-Average Grant Date Fair Value Outstanding 1.22
Weighted-Average Grant Date Fair Value Exercised 1.35
Weighted-Average Grant Date Fair Value Granted 3.44
Weighted-Average Grant Date Fair Value Forfeited 1.24
Weighted-Average Grant Date Fair Value Outstanding $ 1.41