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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (47,550)	$ (22,509)
Stock-based compensation	23,502	17,464
Depreciation and amortization	3,766	2,632
Amortization/(accretion) of note premiums/discounts	193	419
Changes in operating assets and liabilities:
Accounts receivable	(109)	(604)
Prepaid expenses and other current assets	(2,213)	47
Deferred revenue	247,118	(49,630)
Accounts payable	(1,530)	5,768
Accrued expenses	2,271	(5,425)
Other	(497)	723
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	224,951	(51,115)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(11,437)	(7,929)
Purchases of investments	(40,000)	(180,523)
Proceeds from sale of investments	47,545	19,603
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(3,892)	(168,849)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the exercises of stock options	7,735	4,332
Proceeds from the issuance of common stock		250,479
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	7,735	254,811
NET INCREASE (DECREASE) IN CASH	228,794	34,847
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	143,583	221,804
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 372,377	$ 256,651

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