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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]                      
Net income $ (1,444) $ (428) $ 5,169 $ 4,730 $ 351 $ (215) $ 435 $ 3,123 $ 8,027 $ 3,694 $ 7,978
Weighted-average shares outstanding—basic (in shares) 45,997 46,002 45,377 44,930 44,661 44,669 44,775 44,788 45,533 44,595 43,509
Common stock equivalents (in shares)                 928 1,185 1,574
Weighted-average shares outstanding—diluted (in shares) 47,050 46,473 45,780 45,634 45,311 45,224 46,097 46,155 46,461 45,780 45,083
Net income per share:                      
Net income per share—basic (in dollars per share) $ (0.03) $ (0.01) $ 0.11 $ 0.11 $ 0.01 $ 0 $ 0.01 $ 0.07 $ 0.18 $ 0.08 $ 0.18
Net income per share—diluted (in dollars per share) $ (0.03) $ (0.01) $ 0.11 $ 0.10 $ 0.01 $ 0 $ 0.01 $ 0.07 $ 0.17 $ 0.08 $ 0.18