Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
REVENUE	$ 138,287	$ 87,992	$ 168,796
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
OPERATING EXPENSES
Research and development	$ 206,342	$ 128,875	$ 81,049
General and administrative expenses	80,981	52,276	26,556
TOTAL OPERATING EXPENSES	287,323	181,151	107,605
OPERATING INCOME (LOSS)	(149,036)	(93,159)	61,191
OTHER INCOME (EXPENSE)
Interest income (expense), net	6,120	9,191	6,958
Other income (expense), net	2,070	(583)
TOTAL OTHER INCOME (EXPENSE)	8,190	8,608	6,958
INCOME (LOSS) BEFORE INCOME TAXES	(140,846)	(84,551)	68,149
Provision for income taxes	(2)	(2)	(174)
NET INCOME (LOSS)	$ (140,848)	$ (84,553)	$ 67,975
NET INCOME (LOSS) PER SHARE - BASIC	$ (1.36)	$ (0.84)	$ 0.72
NET INCOME (LOSS) PER SHARE - DILUTED	$ (1.36)	$ (0.84)	$ 0.69
Weighted average shares outstanding - basic	103,745	100,722	93,859
Weighted average shares outstanding - diluted	103,745	100,722	98,608
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Foreign currency translation adjustments	$ (87)	$ 410	$ (370)
COMPREHENSIVE INCOME (LOSS)	$ (140,935)	$ (84,143)	$ 67,605