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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accounting Policies [Abstract]        
Net income (loss) $ (428) $ (215) $ 9,471 $ 3,344
Weighted-average shares outstanding - basic (in shares) 46,002 44,669 45,625 44,721
Common stock equivalents (in shares) 471 555 585 1,072
Weighted-average shares outstanding - diluted (in shares) 46,473 45,224 46,210 45,793
Net income (loss) per share:        
Basic (in dollars per share) $ (0.01) $ (0.00) $ 0.21 $ 0.07
Diluted (in dollars per share) $ (0.01) $ (0.00) $ 0.20 $ 0.07