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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
Systems | ​ | $ | 782,559 | ​ | $ | 883,604 | ​ | $ | 692,061
Aftermarket | ​ | ​ | 235,306 | ​ | ​ | 247,000 | ​ | ​ | 227,937
Total Revenue | ​ | $ | 1,017,865 | ​ | $ | 1,130,604 | ​ | $ | 919,998
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
North America | ​ | $ | 144,066 | ​ | $ | 174,810 | ​ | $ | 143,701
Asia Pacific | ​ | ​ | 781,039 | ​ | ​ | 811,308 | ​ | ​ | 673,752
Europe | ​ | ​ | 92,760 | ​ | ​ | 144,486 | ​ | ​ | 102,545
Total Revenue | ​ | $ | 1,017,865 | ​ | $ | 1,130,604 | ​ | $ | 919,998
Schedule of Contract liabilities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ |  | December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 210,885 | ​ | $ | 154,777 | ​ | $ | 68,436
Deferral of revenue* | ​ | ​ | 65,708 | ​ | ​ | 185,688 | ​ | ​ | 146,674
Recognition of deferred revenue | ​ | ​ | (138,419) | ​ | ​ | (129,580) | ​ | ​ | (60,333)
Balance, end of the period | ​ | $ | 138,174 | ​ | $ | 210,885 | ​ | $ | 154,777
​ * Amount is net of a reclassification of $12.7 million from deferred revenue to refund liability for the year ended December 31, 2024.

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