Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (18,506)	$ (47,550)
Stock-based compensation	58,307	23,502
Depreciation and amortization	5,167	3,766
Unrealized (gains) losses on marketable securities	4,153	(773)
Amortization/(accretion) of note premiums/discounts	329	193
Changes in operating assets and liabilities:
Accounts receivable	8,938	(109)
Prepaid expenses and other current assets	(7,914)	(2,213)
Deferred revenue	(54,926)	247,118
Accounts payable	1,146	(1,530)
Accrued expenses	3,699	2,271
Other	990	276
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,383	224,951
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(10,530)	(11,437)
Purchases of investments	(148,391)	(40,000)
Proceeds from sale of investments	55,781	47,545
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(103,140)	(3,892)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the exercises of stock options	3,731	7,735
NET CASH PROVIDED BY FINANCING ACTIVITIES	3,731	7,735
NET INCREASE (DECREASE) IN CASH	(98,026)	228,794
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	184,434	143,583
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 86,408	$ 372,377