Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (62,872)	$ (20,732)
Stock-based compensation	24,504	8,144
Depreciation and amortization	2,573	1,848
Amortization/(accretion) of note premiums/discounts	(280)	(302)
Changes in operating assets and liabilities:
Accounts receivable	10,105	(8,157)
Prepaid expenses and other current assets	(1,181)	(3,193)
Deferred revenue	(27,439)	(12,547)
Accounts payable	(5,389)	(2,002)
Accrued expenses	(2,290)	(1,126)
Other	922	(855)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(61,347)	(38,922)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(5,778)	(4,271)
Purchases of investments	(65,875)
Proceeds from sale of investments	38,268	34,429
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(33,385)	30,158
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the exercises of stock options	1,885	5,102
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	1,885	5,102
NET INCREASE (DECREASE) IN CASH	(92,847)	(3,662)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	184,434	143,583
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 91,587	$ 139,921