Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (84,553,226)	$ 67,974,849	$ (54,450,478)
Change in value of derivatives			(432,141)
Stock-based compensation	43,382,988	12,393,323	8,454,607
Depreciation and amortization	5,942,264	4,439,144	4,699,275
Amortization/(accretion) of note premiums	525,305	1,069,070	383,075
Changes in operating assets and liabilities:
Accounts receivable	(184,312)	(333,986)	(259,578)
Prepaid expenses and other current assets	(387,464)	(3,710,515)	319,166
Deferred revenue	(63,513,696)	82,804,171	(5,269,140)
Accounts payable	(821,012)	4,843,825	(1,270,416)
Accrued expenses	1,989,496	2,450,079	1,016,506
Other	2,228,087	1,104,963	(414,293)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(95,391,570)	173,034,923	(47,223,417)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(11,951,712)	(12,001,225)	(1,421,252)
Purchases of investments	(278,964,290)	(90,266,001)	(52,083,131)
Proceeds from sale of investments	50,138,238	54,521,219	46,069,420
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(240,777,764)	(47,746,007)	(7,434,963)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on notes payable		(2,415,150)	(208,506)
Payment of taxes for net share settled restricted stock unit issuances			(54,667)
Proceeds from the exercises of stock options	7,468,899	8,275,410	3,631,164
Proceeds from the issuance of common stock	250,478,974	60,521,739	56,585,035
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	257,947,873	66,381,999	59,953,026
NET INCREASE (DECREASE) IN CASH	(78,221,461)	191,670,915	5,294,646
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	221,804,128	30,133,213	24,838,567
CASH AND CASH EQUIVALENTS AT END OF PERIOD	143,582,667	221,804,128	30,133,213
Supplementary disclosures:
Interest paid		(27,437)	(173,381)
Income Taxes (Paid) Refunded	$ 103,437	$ (302,400)	$ (2,400)