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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit | Common Stock in Treasury | Non- controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, beginning balance (in shares) at Sep. 30, 2022 |  | 105,960,000 |  |  |  |  |
Beginning balance at Sep. 30, 2022 | $ 418,339 | $ 198 | $ 1,219,213 | $ (136) | $ (820,755) |  | $ 19,819
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 78,130 |  | 78,130 |  |  |  |
Exercise of stock options (in shares) |  | 439,000 |  |  |  |  |
Exercise of stock options | 3,054 | $ 1 | 3,053 |  |  |  |
Common stock - restricted stock units vesting (in shares) |  | 913,000 |  |  |  |  |
Common stock - restricted stock units vesting | 0 | $ 1 | (1) |  |  |  |
Unrealized gains (losses) on available-for-sale securities | (2,964) |  |  | (2,964) |  |  |
Foreign currency translation adjustments | (122) |  |  | (122) |  |  |
Net (loss) income | (209,275) |  |  |  | (205,275) |  | (4,000)
Common stock, ending balance (in shares) at Sep. 30, 2023 |  | 107,312,000 |  |  |  |  |
Ending balance at Sep. 30, 2023 | 287,162 | $ 200 | 1,300,395 | (3,222) | (1,026,030) |  | 15,819
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 73,968 |  | 73,968 |  |  |  |
Exercise of stock options (in shares) |  | 226,000 |  |  |  |  |
Exercise of stock options | 2,389 |  | 2,389 |  |  |  |
Common stock - restricted stock units vesting (in shares) |  | 1,048,000 |  |  |  |  |
Common stock - restricted stock units vesting | 0 | $ 1 | (1) |  |  |  |
Common stock issued, net of offering costs (in shares) |  | 15,790,000 |  |  |  |  |
Common stock issued | 429,265 | $ 16 | 429,249 |  |  |  |
Unrealized gains (losses) on available-for-sale securities | 3,775 |  |  | 3,775 |  |  |
Foreign currency translation adjustments | 4,197 |  |  | 4,197 |  |  |
Net (loss) income | $ (609,693) |  |  |  | (599,493) |  | (10,200)
Common stock, ending balance (in shares) at Sep. 30, 2024 | 124,376,000 | 124,376,000 |  |  |  |  |
Ending balance at Sep. 30, 2024 | $ 191,063 | $ 217 | 1,806,000 | 4,750 | (1,625,523) | $ 0 | 5,619
Treasury stock, ending balance (in shares) at Sep. 30, 2024 | 0 |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | $ 63,366 |  | 63,366 |  |  |  |
Exercise of stock options (in shares) | 535,140 | 535,000 |  |  |  |  |
Exercise of stock options | $ 3,983 |  | 3,983 |  |  |  |
Common stock - restricted stock units vesting (in shares) |  | 1,526,000 |  |  |  |  |
Common stock - restricted stock units vesting | 2 | $ 2 |  |  |  |  |
Common stock issued, net of offering costs (in shares) |  | 11,926,000 |  |  |  |  |
Common stock issued | 241,388 | $ 12 | 241,376 |  |  |  |
Common stock - repurchase (in shares) |  |  |  |  |  | (2,661,000) |
Common stock - repurchase | (53,193) |  |  |  |  | $ (53,193) |
Issuance of pre-funded warrants | 25,000 |  | 25,000 |  |  |  |
Unrealized gains (losses) on available-for-sale securities | 2,125 |  |  | 2,125 |  |  |
Foreign currency translation adjustments | (432) |  |  | (432) |  |  |
Net (loss) income | $ 30,114 |  |  |  | (1,631) |  | 31,745
Common stock, ending balance (in shares) at Sep. 30, 2025 | 135,702,000 | 138,363,000 |  |  |  |  |
Ending balance at Sep. 30, 2025 | $ 503,416 | $ 231 | $ 2,139,725 | $ 6,443 | $ (1,627,154) | $ (53,193) | $ 37,364
Treasury stock, ending balance (in shares) at Sep. 30, 2025 | (2,661,000) |  |  |  |  | (2,661,000) |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
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