Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (2,673,728)	$ 12,037,253
Stock-based compensation	4,491,752	2,717,534
Depreciation and amortization	1,259,884	1,177,352
Amortization/(accretion) of note premiums	177,448	(156,637)
Changes in operating assets and liabilities:
Accounts receivable	(683,937)	(2,841,204)
Prepaid expenses and other current assets	1,377,660	(120,912)
Deferred revenue	(28,770,642)	158,096,440
Accounts payable	4,551,611	1,130,491
Accrued expenses	(4,213,695)	(3,489,712)
Other	953,189	(265,842)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(23,530,458)	168,284,763
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(4,319,714)	(737,487)
Purchases of marketable securities		(69,271,001)
Proceeds from sale of marketable securities	13,600,000	2,252,219
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	9,280,286	(67,756,269)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on notes payable		(2,415,149)
Proceeds from the exercises of stock options	3,001,554	1,004,694
Proceeds from the issuance of common stock	250,476,739	60,521,729
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	253,478,293	59,111,274
NET INCREASE (DECREASE) IN CASH	239,228,121	159,639,768
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	221,804,128	30,133,213
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 461,032,249	189,772,981
Supplementary disclosures:
Interest paid		$ (27,437)