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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities    
Net loss $ (100,980) $ (106,231)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 12,320 7,118
Deferred tax liability 0 (11,045)
Non-cash lease expense 586 1,609
Stock-based compensation 7,934 40,573
Change in fair value of acquisition consideration (5,331) (8,840)
Other non cash adjustments 578 687
Changes in assets and liabilities:    
Accounts receivable, net (8,050) (3,845)
Inventories (606) (12,787)
Prepaid expenses and other current assets (1,591) (1,407)
Other non-current assets 1,206 3,873
Accounts payable (4,211) (762)
Accrued expenses 2,893 1,885
Accrued compensation (2,702) (653)
Other liabilities (404) 832
Net cash used in operating activities (98,358) (88,993)
Cash flows from investing activities    
Purchases of property and equipment (20,877) (44,753)
Business acquisition, net of cash acquired 0 (8,160)
Purchases of investments (50,434) (217,639)
Proceeds from maturity of investments 105,500 30,676
Net cash from (used in) investing activities 34,189 (239,876)
Cash flows from financing activities    
Proceeds from exercise of stock options 855 4,000
Proceeds from public offerings, net of underwriting discounts, commissions and offering expenses 0 269,818
Proceeds from issuance of common stock under employee stock purchase plan 2,536 2,395
Repayments of long-term debt 0 (1,558)
Repurchases of common stock for income tax withholding (2,261) (4,050)
Net cash from financing activities 1,130 270,605
Effect of exchange rates on cash, cash equivalents and restricted cash 341 104
Net decrease in cash, cash equivalents, and restricted cash (62,698) (58,160)
Cash, cash equivalents, and restricted cash at beginning of period 380,259 467,359
Cash, cash equivalents, and restricted cash at end of period 317,561 409,199
Supplemental disclosure of cash flow information    
Interest paid 0 9
Income taxes paid, net of refunds 137 130
Non-cash investing and financing activities    
Property and equipment additions included in accounts payable and accrued expenses 1,747 8,737
Operating lease right-of-use assets obtained in exchange for operating lease liabilities 0 19,494
Issuance of common stock in connection with the business acquisition $ 4,092 $ 77,122