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REVENUE RECOGNITION - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 18,751 $ 16,012 $ 36,636 $ 28,930
Royalty revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 94 $ 179 $ 153 $ 436