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Income Taxes, Deferred Tax Asset Valuation Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 83,378 |  | $ 37,267 |  | $ 18,643 |
Additions charged to cost and expenses |  | $ 38,800 | $ 65,700 | $ 26,900 | 48,211 | [1] | 88,108 | [1] | 43,286 | [1]
Decreases |  |  |  |  | (47,583) |  | (41,997) |  | (24,662) |
Ending balance |  | 84,006 |  |  | 84,006 |  | 83,378 |  | 37,267 |
Deferred Tax Asset Valuation Allowance [Member] |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 47,142 |  | 33,557 |  | 80,186 |
Additions charged to cost and expenses |  |  |  |  | 2,245 | [2] | 13,183 | [3] | 3,231 | [4]
Decreases |  |  |  |  | (27,086) | [5] | (1,825) | [6] | (50,315) | [7]
Adjustments | [8] |  |  |  | 2,036 |  | 2,227 |  | 455 |
Ending balance |  | $ 24,337 |  |  | 24,337 |  | 47,142 |  | 33,557 |
Valuation allowance release of foreign tax credits |  |  |  |  | (18,300) |  |  |  | (32,200) |
Valuation allowance release of R&D credits |  |  |  |  | $ (2,300) |  |  |  |  |
Additional valuation allowance recorded on foreign tax credit carryforward |  |  |  |  |  |  | $ 6,100 |  |  |
Utilization of foreign tax credits |  |  |  |  |  |  |  |  | $ (18,100) |
[1] | During the fourth quarter of 2024, the Company further executed on its product portfolio optimization initiative which resulted in an incremental inventory write-off charge of $38.8 million to the inventory carrying value. During the third quarter of 2023, the Company made the strategic decision to re-balance and narrow its product portfolio, which resulted in an incremental inventory write-off charge of $65.7 million. During the third quarter of 2022, the Company reserved an incremental $26.9 million of inventory.
[2] | Increase in valuation is due primarily to net operating losses in foreign markets.
[3] | Increase in valuation is due primarily to net operating losses in foreign markets and $6.1 million that was recorded on the foreign tax credit carryforward.
[4] | Increase in valuation is primarily due to net operating losses in foreign markets.
[5] | The decrease was due primarily to the release of the valuation allowance against $18.3 million of foreign tax credits and $2.3 million of R&D credits.
[6] | The decrease was due to expiration of foreign net operating losses.
[7] | The decrease was due to utilization of $18.1 million of foreign tax credits and the valuation allowance release of $32.2 million foreign tax credits.
[8] | Represents the net currency effects of translating valuation allowances at current rates of exchange.

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