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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2024
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
​ | ​ | (in thousands)
Systems | ​ | $ | 201,037 | ​ | $ | 231,454 | ​ | $ | 595,114 | ​ | $ | 641,825
Aftermarket | ​ | ​ | 55,527 | ​ | ​ | 60,872 | ​ | ​ | 170,334 | ​ | ​ | 178,491
Total Revenue | ​ | $ | 256,564 | ​ | $ | 292,326 | ​ | $ | 765,448 | ​ | $ | 820,316
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
​ | ​ | (in thousands)
North America | ​ | $ | 32,950 | ​ | $ | 51,563 | ​ | $ | 112,826 | ​ | $ | 134,647
Asia Pacific | ​ | ​ | 202,377 | ​ | ​ | 185,194 | ​ | ​ | 586,754 | ​ | ​ | 582,238
Europe | ​ | ​ | 21,237 | ​ | ​ | 55,569 | ​ | ​ | 65,868 | ​ | ​ | 103,431
Total Revenue | ​ | $ | 256,564 | ​ | $ | 292,326 | ​ | $ | 765,448 | ​ | $ | 820,316
Schedule of Contract liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2024 | ​ | 2023
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 164,026 | ​ | $ | 210,885
​ | ​ | ​ | ​ | ​ | ​ | ​
Contract liabilities are reflected as deferred revenue on the consolidated balance sheets and include payments received in advance of system sales as well as deferral of revenue from systems sales for installation and other future performance obligations. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, |  | September 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 174,011 | ​ | $ | 182,540 | ​ | $ | 210,885 | ​ | $ | 154,777
Deferral of revenue* | ​ | ​ | 31,544 | ​ | ​ | 62,787 | ​ | ​ | 65,222 | ​ | ​ | 154,216
Recognition of deferred revenue | ​ | ​ | (41,529) | ​ | ​ | (43,298) | ​ | ​ | (112,081) | ​ | ​ | (106,964)
Balance, end of the period | ​ | $ | 164,026 | ​ | $ | 202,029 | ​ | $ | 164,026 | ​ | $ | 202,029
​ * Amount is net of a reclassification of $4.7 million from deferred revenue to refund liability for the nine months ended September 30, 2024.

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