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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Systems | ​ | $ | 883,604 | ​ | $ | 692,061 | ​ | $ | 454,598
Aftermarket | ​ | ​ | 247,000 | ​ | ​ | 227,937 | ​ | ​ | 207,830
Total Revenue | ​ | $ | 1,130,604 | ​ | $ | 919,998 | ​ | $ | 662,428
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
North America | ​ | $ | 174,810 | ​ | $ | 143,701 | ​ | $ | 48,715
Asia Pacific | ​ | ​ | 811,308 | ​ | ​ | 673,752 | ​ | ​ | 516,105
Europe | ​ | ​ | 144,486 | ​ | ​ | 102,545 | ​ | ​ | 97,608
Total Revenue | ​ | $ | 1,130,604 | ​ | $ | 919,998 | ​ | $ | 662,428
Schedule of Contract liabilities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 154,777 | ​ | $ | 68,436 | ​ | $ | 23,058
Deferral of revenue | ​ | ​ | 185,688 | ​ | ​ | 146,674 | ​ | ​ | 66,349
Recognition of deferred revenue | ​ | ​ | (129,580) | ​ | ​ | (60,333) | ​ | ​ | (20,971)
Balance, end of the period | ​ | $ | 210,885 | ​ | $ | 154,777 | ​ | $ | 68,436

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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