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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