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Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities:    
Net loss $ (3,752,917) $ (2,821,082)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Stock-based compensation expense 1,360,133 1,152,884
Accretion and amortization on debt securities 98,822 124,440
Depreciation and amortization 117,147 123,117
Provision (recovery) for doubtful accounts (3,773) 6,184
Changes in assets and liabilities:    
Accounts receivable 307,385 1,499,537
Other assets (264,316) (284,398)
Accounts payable 1,064,144 402,149
Accrued payroll and related taxes 195,703 12,580
Deferred revenue 804,912 673,519
Other liabilities 854,702 (46,577)
Net cash provided by operating activities 781,942 842,353
Investing activities:    
Purchases of investments (1,417,086) (8,158,866)
Sales and maturities of investments 3,935,734 7,435,005
Purchases of property and equipment (748,661) (87,047)
Net cash provided by (used in) investing activities 1,769,987 (810,908)
Financing activities:    
Proceeds from exercise of stock options 745,485 541,917
Principal payments on capital lease obligations (8,255) (7,174)
Net cash provided by financing activities 737,230 534,743
Net increase in cash and cash equivalents 3,289,159 566,188
Cash and cash equivalents at beginning of period 6,702,090 5,655,716
Cash and cash equivalents at end of period 9,991,249 6,221,904
Supplemental disclosures of cash flow information:    
Cash paid for interest 4,249 3,122
Cash paid for income taxes 800 800
Supplemental disclosures of non-cash investing and financing activities:    
Unrealized holding gain on available for sale investments 2,536 10,049
Cashless exercise of options and warrants 121 357
Cashless settlement of restricted stock units 12  
Capital lease obligations incurred   $ 95,388