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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Taxes |
Schedule of income (loss) from continuing operations before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
​ | ​ | (in thousands)
Domestic | ​ | $ | 99,711 | ​ | $ | (33,383) | ​ | $ | 47,368
Foreign | ​ |  | (30,877) | ​ |  | 5,045 | ​ |  | 3,617
Total | ​ | $ | 68,834 | ​ | $ | (28,338) | ​ | $ | 50,985
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of components of the expense (benefit) for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
​ | ​ | (in thousands)
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 2,087 | ​ | $ | 3,299 | ​ | $ | —
Foreign | ​ |  | 1,365 | ​ |  | 1,136 | ​ |  | 1,506
State and local | ​ |  | 397 | ​ |  | (194) | ​ |  | 577
Total current expense (benefit) for income taxes | ​ |  | 3,849 | ​ |  | 4,241 | ​ |  | 2,083
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (1,599) | ​ |  | (3,026) | ​ |  | (96,811)
Foreign | ​ |  | (6,684) | ​ |  | 512 | ​ |  | (484)
State and local | ​ |  | (446) | ​ |  | 303 | ​ |  | (20,745)
Total deferred expense (benefit) for income taxes | ​ |  | (8,729) | ​ |  | (2,211) | ​ |  | (118,040)
Total expense (benefit) for income taxes | ​ | $ | (4,880) | ​ | $ | 2,030 | ​ | $ | (115,957)
Schedule of reconciliation of the income tax expense computed using the Federal statutory rate to actual income tax provision | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
​ | ​ | (in thousands)
Income tax expense (benefit) at U.S. statutory rates | ​ | $ | 14,455 | ​ | $ | (5,951) | ​ | $ | 10,706
State taxes, net of U.S. federal impact | ​ |  | 425 | ​ |  | 1,073 | ​ |  | 1,101
Effect of international operations | ​ |  | (2,814) | ​ |  | (7,668) | ​ |  | (11,149)
Research and development tax credit | ​ |  | (7,945) | ​ |  | (7,287) | ​ |  | (6,470)
Net change in valuation allowance | ​ |  | 52 | ​ |  | 662 | ​ |  | (104,972)
Change in accrual for unrecognized tax benefits | ​ |  | 2,534 | ​ |  | (369) | ​ |  | 3,349
Share-based compensation | ​ | ​ | 206 | ​ | ​ | 2,084 | ​ | ​ | 606
Tax benefits associated with asset impairments | ​ | ​ | (11,815) | ​ | ​ | — | ​ | ​ | —
Extinguishment of debt | ​ | ​ | — | ​ | ​ | 19,289 | ​ | ​ | —
Adoption of new accounting standard | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (9,295)
Other | ​ |  | 22 | ​ |  | 197 | ​ |  | 167
Total expense (benefit) for income taxes | ​ | $ | (4,880) | ​ | $ | 2,030 | ​ | $ | (115,957)
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
​ | ​ | (in thousands)
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Inventory valuation |  | $ | 12,500 | ​ | $ | 12,682
Net operating losses | ​ | ​ | 6,734 | ​ |  | 5,841
Credit carry forwards | ​ | ​ | 46,753 | ​ | ​ | 49,086
Warranty and installation accruals | ​ | ​ | 2,054 | ​ |  | 1,766
Share-based compensation | ​ | ​ | 5,802 | ​ |  | 4,637
Contract liabilities | ​ | ​ | 7,775 | ​ | ​ | 19,785
Operating leases | ​ | ​ | 8,620 | ​ | ​ | 8,034
Research and experimental capitalization | ​ | ​ | 46,667 | ​ | ​ | 34,504
Depreciation | ​ | ​ | 4,037 | ​ | ​ | 1,588
Other | ​ | ​ | 5,033 | ​ |  | 4,885
Total deferred tax assets | ​ | ​ | 145,975 | ​ |  | 142,808
Valuation allowance | ​ | ​ | (11,797) | ​ |  | (11,745)
Net deferred tax assets | ​ | ​ | 134,178 | ​ |  | 131,063
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Purchased intangible assets | ​ | ​ | 8,673 | ​ |  | 14,166
Operating leases | ​ | ​ | 6,003 | ​ | ​ | 5,548
Total deferred tax liabilities | ​ | ​ | 14,676 | ​ |  | 19,714
Net deferred taxes |  | $ | 119,502 | ​ | $ | 111,349
Schedule of uncertain tax positions roll-forward | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023 |  | 2022
​ | ​ | (in thousands)
Balance at beginning of year | ​ | $ | 15,741 | ​ | $ | 16,110 | ​ | $ | 12,761
Additions for tax positions related to current year | ​ |  | 2,497 | ​ |  | 2,596 | ​ |  | 4,180
Additions for tax positions related to prior years | ​ |  | 77 | ​ |  | 83 | ​ |  | —
Reductions for tax positions related to prior years | ​ |  | (1,437) | ​ |  | (3,048) | ​ |  | (731)
Settlements | ​ |  | — | ​ |  | — | ​ |  | (100)
Balance at end of year | ​ | $ | 16,878 | ​ | $ | 15,741 | ​ | $ | 16,110

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