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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net loss $ (3,661,317) $ (3,752,917)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Stock-based compensation expense 1,745,121 1,360,133
Depreciation and amortization 236,518 117,147
Accretion and amortization on debt securities 195,937 98,822
Provision for bad debt (4,500) (3,773)
Changes in assets and liabilities:    
Accounts receivable (1,616,192) 307,385
Other assets 46,134 (264,316)
Accounts payable (191,270) 1,064,144
Accrued payroll and related taxes (7,668) 195,703
Deferred revenue 790,488 804,912
Other liabilities (64,716) 854,702
Net cash (used in) provided by operating activities (2,531,465) 781,942
Investing activities:    
Purchases of investments (17,651,627) (1,417,086)
Sales and maturities of investments 4,873,624 3,935,734
Purchases of property and equipment (114,091) (748,661)
Net cash (used in) provided by investing activities (12,892,094) 1,769,987
Financing activities:    
Proceeds from exercise of stock options 58,834 745,485
Principal payments on capital lease obligations (9,208) (8,255)
Net cash provided by financing activities 49,626 737,230
Net (decrease) increase in cash and cash equivalents (15,373,933) 3,289,159
Cash and cash equivalents at beginning of period 23,294,456 6,702,090
Cash and cash equivalents at end of period 7,920,523 9,991,249
Supplemental disclosures of cash flow information:    
Cash paid for interest 3,295 4,249
Cash paid for income taxes 2,131 800
Supplemental disclosures of non-cash investing and financing activities:    
Unrealized holding gain on available-for-sale investments 5,845 2,536
Cashless exercise of stock options 3 121
Common Stock [Member]
    
Supplemental disclosures of non-cash investing and financing activities:    
Cashless settlement of restricted stock units $ 15 $ 12