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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities:    
Net loss $ (5,293,919) $ (5,804,976)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Stock-based compensation expense 2,667,969 2,045,767
Depreciation and amortization 355,320 209,257
Accretion and amortization on debt securities 300,724 154,010
Provision for bad debt (3,200) (1,773)
Changes in assets and liabilities:    
Accounts receivable (1,021,778) 526,702
Other assets (169,498) (171,990)
Accounts payable (281,531) 1,624,875
Accrued payroll and related taxes 131,238 511,717
Deferred revenue 1,116,999 1,053,998
Other liabilities (110,206) 1,476,228
Net cash (used in) provided by operating activities (2,307,882) 1,623,815
Investing activities:    
Purchases of investments (20,691,725) (4,059,036)
Sales and maturities of investments 8,933,624 5,340,734
Purchases of property and equipment (132,199) (1,278,334)
Net cash (used in) provided by investing activities (11,890,300) 3,364
Financing activities:    
Proceeds from the issuance of common stock, net of issuance costs of $0 and $1,122,549, respectively    13,877,447
Proceeds from exercise of stock options 58,834 751,440
Principal payments on capital lease obligations (13,982) (12,524)
Net cash provided by financing activities 44,852 14,616,363
Net (decrease) increase in cash and cash equivalents (14,153,330) 16,243,542
Cash and cash equivalents at beginning of period 23,294,456 6,702,090
Cash and cash equivalents at end of period 9,141,126 22,945,632
Supplemental disclosures of cash flow information:    
Cash paid for interest 4,773 6,231
Cash paid for income taxes 2,226 800
Supplemental disclosures of non-cash investing and financing activities:    
Unrealized holding gain (loss) on available-for-sale investments 897 (2,945)
Cashless exercise of stock options 3 125
Common Stock [Member]
    
Supplemental disclosures of non-cash investing and financing activities:    
Cashless settlement of restricted stock units $ 15 $ 16