Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (217,863)	$ (152,098)	$ (139,931)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	16,514	9,750	6,677
Non-cash lease expense, net of tenant improvement allowance	20,127	2,243	(1,043)
Gain on deconsolidation of Revelar	(4,607)	0	0
Loss on disposal of property and equipment	0	2	0
Stock-based compensation	79,664	36,998	17,096
Discount (premium) accretion on investment securities	1,315	593	(214)
Realized gain on investments	0	(5)	0
Allowance for doubtful accounts	(11)	40	0
Change in fair value of contingent considerations and holdbacks	(14,245)	(534)	0
Non-cash interest expense	3	67	152
Amortization of debt discount	4	81	184
Write off property and equipment	70	0	0
Changes in assets and liabilities:
Accounts receivable, net	(9,622)	(2,202)	(14,272)
Inventories	(7,536)	(19,489)	(4,956)
Prepaid expenses and other current assets	(2,551)	(2,058)	(3,683)
Other non-current assets	7,273	(4,653)	(554)
Accounts payable	7,383	8,542	(5,506)
Accrued expenses	2,269	3,115	(2,648)
Accrued compensation	4,852	7,392	4,465
Other liabilities	(7,424)	(28)	1,978
Net cash used in operating activities	(124,385)	(112,244)	(142,255)
Cash flows from investing activities
Purchases of property and equipment	(101,857)	(27,061)	(9,868)
Business acquisition, net of cash acquired	(8,160)	(483)	0
Deconsolidation of cash and cash equivalent relating to Revelar	(5,755)	0	0
Purchases of investments	(217,639)	(58,795)	(202,882)
Proceeds from maturity of investments	100,481	242,494	98,100
Net cash provided by (used in) investing activities	(232,930)	156,155	(114,650)
Cash flows from financing activities
Proceeds from exercise of stock options	6,014	14,559	10,495
Proceeds from public offerings, net of underwriting discounts, commissions and offering expenses	269,822	323,861	295,563
Proceeds from issuance under employee stock purchase plan	4,010	4,944	3,428
Repayments of long-term debt	(1,558)	(3,333)	(3,333)
Repurchases of common stock for income tax withholding	(7,754)	(10,849)	(2,421)
Net cash provided by financing activities	270,534	329,182	303,732
Effect of exchange rates on cash, cash equivalents and restricted cash	(319)	20	21
Net increase (decrease) in cash, cash equivalents and restricted cash	(87,100)	373,113	46,848
Cash, cash equivalents, and restricted cash at beginning of year	467,359	94,246	47,398
Cash, cash equivalents, and restricted cash at end of year	380,259	467,359	94,246
Supplemental disclosure of cash flow information
Interest paid	9	167	438
Income taxes paid, net of refunds	246	101	172
Non-cash investing and financing activities
Property and equipment additions included in accrued expenses and accounts payable	6,297	2,011	1,333
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	21,367	33,617	3,718
Issuance of common stock in connection with the business acquisition	$ 77,122	$ 26,773	$ 0