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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, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share Basic And Diluted [Line Items]                              
Net income (loss) $ (2,127) $ (2,784) $ (1,160) $ (5,736) $ 12,866 $ 616 $ 1,217 $ (607) $ 960 $ 739 $ 582 $ (322) $ (11,807) $ 14,092 $ 1,959
Weighted-average shares outstanding—basic (in shares) 37,858 36,190 34,976 34,207 33,522 33,024 32,786 32,377 32,086 31,823 31,326 31,094 35,811 33,083 31,587
Common stock equivalents (in shares)                         0 2,454 2,232
Weighted-average shares outstanding—diluted (in shares) 37,858 36,190 34,976 34,207 36,251 35,610 34,815 32,377 34,860 34,532 33,134 31,094 35,811 35,537 33,819
Net income (loss) per share:                              
Basic (in dollars per share) $ (0.06) $ (0.08) $ (0.03) $ (0.17) $ 0.38 $ 0.02 $ 0.04 $ (0.02) $ 0.03 $ 0.02 $ 0.02 $ (0.01) $ (0.33) $ 0.43 $ 0.06
Diluted (in dollars per share) $ (0.06) $ (0.08) $ (0.03) $ (0.17) $ 0.35 $ 0.02 $ 0.03 $ (0.02) $ 0.03 $ 0.02 $ 0.02 $ (0.01) $ (0.33) $ 0.40 $ 0.06