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Quarterly Information (Unaudited) - Schedule of Quarterly Financial Data (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 7,865,853 | $ 6,439,995 | $ 5,672,326 | $ 5,389,322 | $ 5,543,959 | $ 4,659,724 | $ 4,484,138 | $ 4,462,524 | $ 4,387,232 | $ 3,882,027 | $ 3,224,262 | $ 3,309,664 | $ 25,367,496 | $ 19,150,345 | $ 14,803,185
Cost of revenue | 824,814 | 591,330 | 557,653 | 497,401 | 520,428 | 607,586 | 449,214 | 570,697 | 377,066 | 469,445 | 417,092 | 339,996 |  |  |
Operating expenses | 6,079,139 | 5,539,252 | 4,628,179 | 4,758,047 | 5,088,546 | 5,702,578 | 6,246,447 | 5,372,675 | 5,486,601 | 5,470,233 | 5,206,556 | 4,335,734 |  |  |
Operating income (loss) | 961,900 | 309,413 | 486,494 | 133,874 | (65,015) | (1,650,440) | (2,211,523) | (1,480,848) | (1,476,435) | (2,057,651) | (2,399,386) | (1,366,066) | 1,891,681 | (5,407,826) | (7,299,538)
Interest and other income | 26,107 | 30,101 | 22,276 | 16,253 | 68,688 | 19,479 | 21,252 | 15,209 | 7,726 | 7,578 | 8,017 | 8,449 | 94,737 | 124,628 | 31,770
Interest and other expense | (787) | (342) | (1,120) | (1,050) | (1,624) | (1,545) | (1,576) | (1,700) | (1,745) | (1,986) | (1,106) | (2,025) | (3,299) | (6,445) | (6,862)
Income tax provision (benefit) | 31,872 | (577,789) |  | 2,897 |  | 95 | 1,170 | 961 | 276 |  | 800 |  | (543,020) | 2,226 | 1,076
Net income (loss) | $ 955,348 | $ 916,961 | $ 507,650 | $ 146,180 | $ 2,049 | $ (1,632,601) | $ (2,193,017) | $ (1,468,300) | $ (1,470,730) | $ (2,052,059) | $ (2,393,275) | $ (1,359,642) | $ 2,526,139 | $ (5,291,869) | $ (7,275,706)
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic income (loss) per share | $ 0.03 | $ 0.03 | $ 0.02 | $ 0.00 | $ 0.00 | $ (0.05) | $ (0.07) | $ (0.05) | $ (0.05) | $ (0.08) | $ (0.09) | $ (0.05) | $ 0.08 | $ (0.17) | $ (0.26)
Shares used in calculating net income (loss) per share—basic | 30,969,157 | 30,764,694 | 30,697,391 | 30,618,097 | 30,510,587 | 30,481,168 | 30,453,455 | 30,402,397 | 27,492,670 | 27,109,787 | 26,473,938 | 26,024,288 | 30,790,258 | 30,466,063 | 27,492,670
Diluted income (loss) per share | $ 0.03 | $ 0.03 | $ 0.02 | $ 0.00 | $ 0.00 | $ (0.05) | $ (0.07) | $ (0.05) | $ (0.05) | $ (0.08) | $ (0.09) | $ (0.05) | $ 0.08 | $ (0.17) | $ (0.26)
Shares used in calculating net income (loss) per share - diluted | 31,664,178 | 31,645,696 | 31,321,259 | 31,173,815 | 31,022,148 | 30,481,168 | 30,453,455 | 30,402,397 | 27,492,670 | 27,109,787 | 26,473,938 | 26,024,288 | 31,480,241 | 30,466,063 | 27,492,670

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