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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue. |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ | ​ | December 31,
​ | ​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | (in thousands)
Systems | ​ | ​ | $ | 454,598 | ​ | $ | 293,624 | ​ | $ | 202,571
Aftermarket | ​ | ​ | ​ | 207,830 | ​ | ​ | 180,936 | ​ | ​ | 140,387
Total Revenue | ​ | ​ | $ | 662,428 | ​ | $ | 474,560 | ​ | $ | 342,958
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ | ​ | December 31,
​ | ​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | (in thousands)
North America | ​ | ​ | $ | 48,715 | ​ | $ | 50,786 | ​ | $ | 36,206
Asia Pacific | ​ | ​ | ​ | 516,105 | ​ | ​ | 385,233 | ​ | ​ | 251,020
Europe | ​ | ​ | ​ | 97,608 | ​ | ​ | 38,541 | ​ | ​ | 55,732
Total Revenue | ​ | ​ | $ | 662,428 | ​ | $ | 474,560 | ​ | $ | 342,958
Schedule of Contract liabilities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ |  | December 31,
​ | ​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | (in thousands)
Balance, beginning of the period | ​ | ​ | $ | 23,058 | ​ | $ | 29,251 | ​ | $ | 22,584
Deferral of revenue | ​ | ​ | ​ | 66,349 | ​ | ​ | 17,862 | ​ | ​ | 24,403
Recognition of deferred revenue | ​ | ​ | ​ | (20,971) | ​ | ​ | (24,055) | ​ | ​ | (17,736)
Balance, end of the period | ​ | ​ | $ | 68,436 | ​ | $ | 23,058 | ​ | $ | 29,251

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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