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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - COMPUTATION OF BASIC AND DILUTED NET INCOME (LOSS) PER SHARE (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share Basic And Diluted [Line Items]                              
Net income $ 12,866 $ 616 $ 1,217 $ (607) $ 960 $ 739 $ 582 $ (322) $ 955 $ 918 $ 507 $ 146 $ 14,092 $ 1,959 $ 2,526
Weighted-average common shares and share equivalents outstanding—basic (in shares) 33,522 33,024 32,786 32,377 32,086 31,823 31,326 31,094 30,969 30,765 30,697 30,618 33,083 31,587 30,790
Weighted-average common shares and share equivalents outstanding—diluted (in shares) 36,251 35,610 34,815 32,377 34,860 34,532 33,134 31,094 31,664 31,646 31,321 31,174 35,537 33,819 31,480
Net income per share:                              
Basic (in dollars per share) $ 0.38 $ 0.02 $ 0.04 $ (0.02) $ 0.03 $ 0.02 $ 0.02 $ (0.01) $ 0 $ 0.03 $ 0.02 $ 0.00 $ 0.43 $ 0.06 $ 0.08
Diluted (in dollars per share) $ 0.35 $ 0.02 $ 0.03 $ (0.02) $ 0.03 $ 0.02 $ 0.02 $ (0.01) $ 0 $ 0.03 $ 0.02 $ 0.00 $ 0.40 $ 0.06 $ 0.08
Stock options                              
Earnings Per Share Basic And Diluted [Line Items]                              
Dilutive potential common stock equivalents (in shares)                         2,454 2,232 690