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Consolidated Statements of Cash Flows (unaudited) - USD ($)
 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (28,083,189) $ (18,128,667)
Change in value of derivatives (432,141) (1,456,448)
Stock-based compensation 3,549,354 4,168,673
Depreciation and amortization 2,294,639 2,373,255
Amortization/(accretion) of note premiums 346,339 (64,387)
Changes in operating assets and liabilities:    
Accounts receivable 51,510 (505,825)
Prepaid expenses and Other Current Assets 1,225,562 2,524,107
Deferred revenue (3,704,740) 17,307,431
Accounts payable (2,266,082) (4,988,620)
Accrued expenses (2,918,752) (5,415,933)
Other (196,434) (139,452)
NET CASH (USED IN) OPERATING ACTIVITIES (30,133,934) (4,325,866)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (513,719) (6,653,158)
Purchases of marketable securities (5,018,040) (24,846,105)
Proceeds from sale of marketable securities 23,704,420  
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 18,172,661 (31,499,263)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (102,406) (97,145)
Payments of taxes for net share settled restricted stock unit issuances (54,667) (417,140)
Proceeds from the exercises of warrants and stock options 499,861  
Proceeds from the issuance of common stock 56,585,035 12,691,937
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 56,927,823 12,177,652
NET INCREASE (DECREASE) IN CASH 44,966,550 (23,647,477)
CASH AT BEGINNING OF PERIOD 24,838,567 85,366,448
CASH AT END OF PERIOD 69,805,117 61,718,971
Supplementary disclosures:    
Interest Paid (88,537) (95,544)
Income Tax Credits Refunded   3,635,016
Income Tax Paid $ (2,400) $ (2,400)