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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2022
Revenue |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Systems | ​ | $ | 165,350 | ​ | $ | 100,138 | ​ | $ | 317,152 | ​ | $ | 181,129
Aftermarket | ​ | ​ | 55,827 | ​ | ​ | 47,136 | ​ | ​ | 107,620 | ​ | ​ | 98,921
Total Revenue | ​ | $ | 221,177 | ​ | $ | 147,274 | ​ | $ | 424,772 | ​ | $ | 280,050
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
North America | ​ | $ | 34,683 | ​ | $ | 10,204 | ​ | $ | 59,596 | ​ | $ | 19,712
Asia Pacific | ​ | ​ | 168,705 | ​ | ​ | 116,642 | ​ | ​ | 317,945 | ​ | ​ | 220,033
Europe | ​ | ​ | 17,789 | ​ | ​ | 20,428 | ​ | ​ | 47,231 | ​ | ​ | 40,305
Total Revenue | ​ | $ | 221,177 | ​ | $ | 147,274 | ​ | $ | 424,772 | ​ | $ | 280,050
Schedule of Contract liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 71,549 | ​ | $ | 68,436
​ | ​ | ​ | ​ | ​ | ​ | ​
​ Contract liabilities are reflected as deferred revenue on the consolidated balance sheet and relate to payments invoiced or received in advance of completion of performance obligations under a contract. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, |  | June 30,
​ | ​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 74,840 | ​ | $ | 22,142 | ​ | $ | 68,436 | ​ | $ | 23,058
Deferral of revenue | ​ | ​ | 28,703 | ​ | ​ | 21,893 | ​ | ​ | 46,697 | ​ | ​ | 30,117
Recognition of deferred revenue | ​ | ​ | (31,994) | ​ | ​ | (8,517) | ​ | ​ | (43,584) | ​ | ​ | (17,657)
Balance, end of the period | ​ | $ | 71,549 | ​ | $ | 35,518 | ​ | $ | 71,549 | ​ | $ | 35,518

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- Definition Tabular disclosure of revenue from external customers by discipline areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References No definition available. + Details
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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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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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