Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (33,407)	$ (28,986)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	8,099	7,139
Depreciation and amortization expense	642	511
Non cash interest expense associated with the sale of future royalties	299	0
Non-cash royalty revenue	487	0
Amortization (accretion) of premiums (discounts) on marketable securities	274	(339)
Change in operating assets and liabilities:
Accounts receivable	441	(2,267)
Prepaid expenses and other current assets	18	(4,501)
Income tax receivable	(730)	15
Operating lease, right-of-use assets	1,450	834
Other long-term assets	38	(5)
Accounts payable	5,174	(686)
Accrued expenses	(6,736)	(6,599)
Operating lease liabilities	(1,023)	(717)
Other long-term liabilities	(14)	(40)
Net cash used in operating activities	(24,988)	(35,641)
Cash flows from investing activities
Purchase of marketable securities	(146,845)	(67,375)
Proceeds from maturities and sale of marketable securities	134,515	104,100
Purchase of property and equipment	(787)	(3,156)
Net cash provided by (used in) investing activities	(13,117)	33,569
Cash flows from financing activities
Payments on royalty sale liability, net of imputed interest	(7,167)	0
Payments for settlement of share-based awards	(183)	(825)
Proceeds from exercise of stock options	0	1,126
Net cash provided by (used in) financing activities	(7,350)	301
Net decrease in cash, cash equivalents and restricted cash	(45,455)	(1,771)
Cash, cash equivalents and restricted cash at beginning of period	89,356	47,962
Cash, cash equivalents and restricted cash at end of period	43,901	46,191
Supplemental disclosure of noncash information:
Purchases of fixed assets included in accounts payable and accrued expenses	479	1,079
Operating lease liabilities arising from obtaining right-of-use assets	0	799
Supplemental disclosure of cash flow information
Cash paid for interest	$ 3,143	$ 0