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QUARTERLY INFORMATION (UNAUDITED) - SCHEDULE OF QUARTERLY FINANCIAL DATA (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 12,904 | $ 11,798 | $ 11,419 | $ 9,269 | $ 9,670 | $ 9,105 | $ 8,522 | $ 7,404 | $ 7,866 | $ 6,440 | $ 5,672 | $ 5,389 | $ 45,390 | $ 34,701 | $ 25,367
Cost of revenue | 1,138 | 1,182 | 830 | 891 | 940 | 793 | 720 | 942 | 825 | 591 | 558 | 497 |  |  |
Operating expenses | 10,033 | 10,132 | 9,365 | 9,050 | 7,889 | 7,618 | 7,171 | 6,804 | 6,079 | 5,539 | 4,628 | 4,758 |  |  |
Operating income | 1,733 | 484 | 1,224 | (672) | 841 | 694 | 631 | (342) | 962 | 310 | 486 | 134 | 2,769 | 1,824 | 1,892
Other income, net | 121 | 149 | 67 | 65 | 23 | 45 | 30 | 36 | 25 | 30 | 21 | 15 | 402 | 134 | 91
Income tax benefit (provision) | 11,012 | (17) | (74) | 0 | 96 | 0 | (79) | (16) | (32) | 578 | 0 | (3) | 10,921 | 1 | 543
Net income | $ 12,866 | $ 616 | $ 1,217 | $ (607) | $ 960 | $ 739 | $ 582 | $ (322) | $ 955 | $ 918 | $ 507 | $ 146 | $ 14,092 | $ 1,959 | $ 2,526
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic income (loss) per share (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
Shares used in calculating net income per share—basic | 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
Diluted income (loss) per share (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
Shares used in calculating net income (loss) per share - diluted | 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

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