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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2022
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ | ​ | December 31,
​ | ​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | (in thousands)
Systems | ​ | ​ | $ | 692,061 | ​ | $ | 454,598 | ​ | $ | 293,624
Aftermarket | ​ | ​ | ​ | 227,937 | ​ | ​ | 207,830 | ​ | ​ | 180,936
Total Revenue | ​ | ​ | $ | 919,998 | ​ | $ | 662,428 | ​ | $ | 474,560
​
| (b) | Economic Factors Affecting our Revenue: Geographic Breakdown of Revenue
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ | ​ | December 31,
​ | ​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | (in thousands)
North America | ​ | ​ | $ | 143,701 | ​ | $ | 48,715 | ​ | $ | 50,786
Asia Pacific | ​ | ​ | ​ | 673,752 | ​ | ​ | 516,105 | ​ | ​ | 385,233
Europe | ​ | ​ | ​ | 102,545 | ​ | ​ | 97,608 | ​ | ​ | 38,541
Total Revenue | ​ | ​ | $ | 919,998 | ​ | $ | 662,428 | ​ | $ | 474,560
​
| (c) | Recognition of Deferred Revenue from Contract Liabilities
Schedule of Contract liabilities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended | ​ | ​ | ​
​ | ​ |  | December 31,
​ | ​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | (in thousands)
Balance, beginning of the period | ​ | ​ | $ | 68,436 | ​ | $ | 23,058 | ​ | $ | 29,251
Deferral of revenue | ​ | ​ | ​ | 146,674 | ​ | ​ | 66,349 | ​ | ​ | 17,862
Recognition of deferred revenue | ​ | ​ | ​ | (60,333) | ​ | ​ | (20,971) | ​ | ​ | (24,055)
Balance, end of the period | ​ | ​ | $ | 154,777 | ​ | $ | 68,436 | ​ | $ | 23,058
​

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