Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Royalty revenue	$ 19,479	$ 21,624	$ 65,843	$ 73,499
Type Of Revenue Extensible List	us-gaap:RoyaltyMember	us-gaap:RoyaltyMember	us-gaap:RoyaltyMember	us-gaap:RoyaltyMember
Operating expenses:
Research and development	$ 39,090	$ 46,994	$ 129,726	$ 125,165
General and administrative	12,929	8,477	32,913	24,180
Total operating expenses	52,019	55,471	162,639	149,345
Loss from operations	(32,540)	(33,847)	(96,796)	(75,846)
Other income:
Other income, net	393	439	942	1,661
Total other income, net	393	439	942	1,661
Loss before income taxes	(32,147)	(33,408)	(95,854)	(74,185)
Income tax benefit	447	9,384	447	19,788
Net loss	$ (31,700)	$ (24,024)	$ (95,407)	$ (54,397)
Net loss per share:
Basic	$ (1.53)	$ (1.19)	$ (4.64)	$ (2.70)
Diluted	$ (1.53)	$ (1.19)	$ (4.64)	$ (2.70)
Weighted average shares outstanding:
Basic	20,710	20,201	20,552	20,155
Diluted	20,710	20,201	20,552	20,155