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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue. |
Schedule of revenue by discipline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
​ | ​ | (in thousands)
Systems | ​ | $ | 126,166 | ​ | $ | 70,239 | ​ | $ | 307,295 | ​ | $ | 229,391
Aftermarket | ​ | ​ | 50,528 | ​ | ​ | 40,166 | ​ | ​ | 149,449 | ​ | ​ | 122,970
Total Revenue | ​ | $ | 176,694 | ​ | $ | 110,405 | ​ | $ | 456,744 | ​ | $ | 352,361
Schedule of revenue by geographic markets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
​ | ​ | (in thousands)
North America | ​ | $ | 11,847 | ​ | $ | 9,022 | ​ | $ | 31,560 | ​ | $ | 28,598
Asia Pacific | ​ | ​ | 137,870 | ​ | ​ | 89,995 | ​ | ​ | 357,903 | ​ | ​ | 293,427
Europe | ​ | ​ | 26,977 | ​ | ​ | 11,388 | ​ | ​ | 67,281 | ​ | ​ | 30,336
Total Revenue | ​ | $ | 176,694 | ​ | $ | 110,405 | ​ | $ | 456,744 | ​ | $ | 352,361
Schedule of Contract liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 58,240 | ​ | $ | 23,058
​ | ​ | ​ | ​ | ​ | ​ | ​
​ 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 | ​ | Nine months ended
​ | ​ | September 30, |  | September 30,
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 35,518 | ​ | $ | 30,416 | ​ | $ | 23,058 | ​ | $ | 29,251
Deferral of revenue | ​ | ​ | 38,867 | ​ | ​ | 4,030 | ​ | ​ | 55,011 | ​ | ​ | 10,320
Recognition of deferred revenue | ​ | ​ | (16,145) | ​ | ​ | (17,477) | ​ | ​ | (19,829) | ​ | ​ | (22,602)
Balance, end of the period | ​ | $ | 58,240 | ​ | $ | 16,969 | ​ | $ | 58,240 | ​ | $ | 16,969

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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=121604090&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=120311839&loc=d3e9038-108599 + Details
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