Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (208,726)	$ (204,618)	$ (217,863)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	31,432	29,310	16,514
Impairment of long-lived assets	44,930	6,785	0
Non-cash lease expense, net of tenant improvement allowance	940	2,573	20,127
Stock-based compensation	50,925	30,278	79,664
Change in fair value of contingent considerations and holdbacks	0	(5,913)	(14,245)
Gain on deconsolidation of Revelar	0	0	(4,607)
Other non-cash adjustments	994	120	1,381
Changes in assets and liabilities:
Accounts receivable, net	8,444	(4,320)	(9,622)
Inventories	7,986	7,238	(7,536)
Prepaid expenses and other current assets	382	(4,166)	(2,551)
Other non-current assets	431	1,376	7,273
Accounts payable	(11,805)	(2,508)	7,383
Accrued expenses	4,415	2,578	2,269
Accrued compensation	7,875	(1,099)	4,852
Other liabilities	(2,317)	(108)	(7,424)
Net cash used in operating activities	(64,094)	(142,474)	(124,385)
Cash flows from investing activities
Purchases of property and equipment	(5,076)	(27,779)	(101,857)
Business acquisition, net of cash acquired	0	0	(8,160)
Deconsolidation of cash and cash equivalent relating to Revelar	0	0	(5,755)
Purchases of investments	(51,905)	(76,345)	(217,639)
Proceeds from maturity of investments	53,910	154,736	100,481
Net cash provided by (used in) investing activities	(3,071)	50,612	(232,930)
Cash flows from financing activities
Proceeds from exercise of stock options	7,100	1,379	6,014
Proceeds from public offerings, net of underwriting discounts, commissions and offering expenses	0	0	269,822
Proceeds from issuance under employee stock purchase plan	3,765	3,937	4,010
Repayments of long-term debt	0	0	(1,558)
Repurchases of common stock for income tax withholding	(3,975)	(4,405)	(7,754)
Net cash provided by financing activities	6,890	911	270,534
Effect of exchange rates on cash, cash equivalents and restricted cash	126	(27)	(319)
Net increase (decrease) in cash, cash equivalents and restricted cash	(60,149)	(90,978)	(87,100)
Cash, cash equivalents, and restricted cash at beginning of year	289,281	380,259	467,359
Cash, cash equivalents, and restricted cash at end of year	229,132	289,281	380,259
Supplemental disclosure of cash flow information
Interest paid	0	0	9
Income taxes paid, net of refunds	344	420	246
Non-cash investing and financing activities
Property and equipment additions included in accrued expenses and accounts payable	92	772	6,297
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	0	6,676	21,367
Issuance of common stock in connection with the business acquisition	0	5,860	77,122
Tenant improvement allowance capitalized in property and equipment	2,719	0	0
Conversion of convertible notes	$ 0	$ 3,711	$ 0