Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue
Total revenue	$ 205,197	$ 206,625	$ 102,814
Operating expenses:
Research and development	142,213	94,856	57,451
General and administrative	26,246	23,441	20,749
Total operating expenses	168,459	118,297	78,200
Income from operations	36,738	88,328	24,614
Other income (expense), net:
Interest income (expense), net	8,819	4,852	2,492
Change in fair value of warrant liability and Series 1 nonconvertible preferred stock		(59)	(159)
Total other income (expense), net	8,819	4,793	2,333
Income before income taxes	45,557	93,121	26,947
Income tax benefit (expense)	826	(21,165)	(9,237)
Net income	$ 46,383	$ 71,956	$ 17,710
Net income per share:
Basic	$ 2.37	$ 3.74	$ 0.93
Diluted	$ 2.21	$ 3.48	$ 0.91
Weighted average shares outstanding:
Basic	19,584	19,255	19,066
Diluted	20,968	20,650	19,407
Royalties [Member]
Revenue
Total revenue	$ 205,197	$ 191,625	$ 37,814
Milestone [Member]
Revenue
Total revenue		$ 15,000	$ 65,000