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Consolidated Statements of Cash Flows (unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (13,198,878) $ (12,086,108)
Change in value of derivatives (450,739) (1,483,831)
Stock-based compensation 2,092,541 2,424,442
Depreciation and amortization 1,141,173 1,185,611
Amortization/(accretion) of note premiums 107,783  
Changes in operating assets and liabilities:    
Accounts receivable (82,134) 15,000
Prepaid expenses and Other Current Assets (29,223) 1,027,021
Deferred revenue (3,394,740) 25,652,536
Accounts payable 1,630,533 (4,648,013)
Accrued expenses (2,550,703) (1,850,996)
Other 43,907 (235,471)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES (14,690,480) 10,000,191
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (135,414) (5,296,653)
Purchases of marketable securities (5,018,040)  
Proceeds from sale of marketable securities 6,510,420  
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 1,356,966 (5,296,653)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (197,790) (47,277)
Payments of taxes for net share settled restricted stock unit issuances   (417,140)
Proceeds from the exercises of warrants and stock options 224,082  
Proceeds from the issuance of common stock   12,500,000
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 26,292 12,035,583
NET INCREASE (DECREASE) IN CASH (13,307,222) 16,739,121
CASH AT BEGINNING OF PERIOD 24,838,567 85,366,448
CASH AT END OF PERIOD 11,531,345 102,105,569
Supplementary disclosures:    
Interest Paid $ (44,722) (48,195)
Property and Equipment expenditures included in accounts payable and accrued expenses   $ (1,041,276)